I think it is background - both training and experience.
The MOOG RWS is a comprehensive weapon system which can be configured in many ways to include anti-air, anti-armour and a combination. The M-SHORAD configuration includes both a Stinger and Longbow Hellfire. The Stinger is basically IR with a range just under 5 km and a ceiling of just under 4 km. The Longbow Hellfire costs roughly four to five times what a Stinger costs and has a range out to 11 km and is laser or radar guided.
Let's ask the big question: why mount an expensive 11 km missile on a Manoeuvre-Short Range Air Defence system (especially a $150,000 missile). The stock answer is to be able to guide it on attack helicopters and attack aircraft which are employing countermeasures and against targets beyond the range of the Stinger. It's
not to use against ground targets because you'll rarely have a line of sight from a ground based system that would exploit the range of the Hellfire. You can do it if push comes to shove but if that was the intent the system would have been called M-SHORADAT.
I'll add another possibility: you mount the Hellfire because you can. You could have mounted dual Stinger pods, like on an Avenger, but this gives you a bit further reach and sells some pricey missiles to boot which is always a contractor's aim.
An M-SHORAD firing a Hellfire needs to remain exposed for line of sight control (unless there are remote controllers deployed to hand the missile off to) which is not a great idea when in contact with folks that shoot back. On the other hand a Javelin (which is comparable in cost with the Hellfire) can easily engage most things within typical ground terrain ranges which are generally within the missiles envelope of just under 5 kms and is fire and forget. A terrific advantage.
The point though is that neither AD nor AT is a system that depends on a single operator acquiring a target and engaging it like a tank does.
AD in particular depends on a complex system of systems that acquire targets far out through multiple radar systems, vectoring and allocating gun or missile systems against the targets (which usually come in multiples) and exercising engagement control. Even self-defence missiles such as the AD Javelin type or MANPADS are generally "netted" into the system for early warning if nothing else. Essentially they are sighted to provide area defence and against likely air threats and generally not mixed in with the front line troops because most front line are generally avoiding exactly the places that AF systems needed to be sighted to be effective (high and open ground).
Anti-armour systems are likewise netted into the anti-armour plan which concerns itself with ground threats and is deployed in a layered system which focuses on axis of ground advance and channelized killing zones. Different people develop the anti-armour plan and the air defence plan based on quite different criteria and quite different, albeit complementary, command and control measures. Quite frankly if I'm reading the tea leaves right, our anti-armour plan in the future will depend more on specialized anti-armour units employing drones and loitering munitions well forward of the main defensive line probably as part of a cavalry regiment.
It's kind of like machine guns. Any moron can fire a machine gun but it takes an expert to create a proper integrated defence plan capable of exploiting the maximum killing power of a number of machine guns properly sited to be mutually supporting.
It takes even more training and practice to develop a good anti-armour platoon or an air defence troop. Even more for an anti-armour company and air defence battery or regiment.
When we rebuilt air defence in the 1970s it was roughly a five year job before we got our officers and Snr NCOs to the point where they had developed the skills and competency at their jobs to be effective and the batteries became sustainable. Manning and operating the weapon is probably the easiest part of the job. Deploying the systems and controlling them to maximum effect is the hard part.
We trialed ADATs in a direct fire system in the mid 2000s when Hillier was dumping the tanks. We mixed it in with TOW and notional MGSs and the end result was that it was a dumb idea which only served one purpose - to try to justify a bad decision to divest the tanks and to try to justify why we should continue to spend money maintaining ADATS and its associated PYs (and the speculative MMEV) Eventually the geniuses the running the Army figured we'd never need to shoot down another airplane ever again and ash caned the thing. (although we deployed it at Kananaskis at the G8 in 2002 while 9/11 was fresh on everyone's mind).
Note as well that GBAD's SOR requires the system to be also capable of engaging projectiles such as mortars, rockets and artillery. Add to that the proliferation of UAVs and you can see that AD resources will be full-time employed keeping all natures of pesky airborne things off the manoeuvre unit's back.
I'll add one more thing - AD elements are magnets for all kinds of incoming crap. You don't really want it mixed into your anti-armour defence where it gives away your presence and draws all manners of unwanted shyte down on your positions.
So. My final thoughts. I actually like concepts like the MOOG system. I think it gives you the ability to have a common chassis (with everything that entails in ease of maintenance. It gives you a remote weapon station where much of the mechanics are interchangeable (again with ease of maintenance) and the flexibility to tailor specific weapon systems to specific missions. Quite frankly I wonder why we still have a manned turret on the LAV. Even better when you have a common configurable system that would operate on the LAV and the TAPV and any other armoured vehicle we might purchase.
Do I see some need for some type of self defence system against things like UAVs within a manoeuvre unit? Possibly depending on what the full capability of GBAD will be. My gut tells me that there will be gaps which will need to be filled. Whether that's something like a MANPADS det or a TAPV with a directed energy weapon or a hand portable laser or whatever and who operates it, I'm not sure. Again, my gut tells me if its directed at an air threat it will probably be an attachment to a manoeuvre unit like a FOO is now (possible even as an element of the FOO party) and not an organic element.