As someone with experience commanding vehicles with a unified gunner/commander position - I dont think you guys realize how hard it is to crew command them safely and in a tactically effective way. Now I know infantry crew commanders are a bit more lax with positions and vehicle tactics, but the same principles apply and it is tricky business commanding the vehicle, battle tracking on your map, gunning and navigating simultaneously. Shoot, move, communicate all at once at 50kmh. In a two person turret the commander's workload is cut in half, meaning drills, positioning, nav, etc are superior.
That said, this may not apply to a mech inf CC, Im not actually too sure what their tactics look like on that front, it may be simple enough to get by without suffering too much performance wise. I may just be overthinking IFV RWS as a crewman.
I 100% agree with you.
But as
@FJAG notes, the issue what the role of the vehicle is for.
To me an AFV in the "assault role" needs a 3-4 person crew. There is only so much that one person can do to retain SA in a moving vehicle, keep it in the fight and engage effectively and not be a danger to friendlies, the 2 person turret is a check and balance to ensure that the weapons are not brought to bear on the wrong targets.
To quote a friend of mine during some operations in Iraq, "the Abrams is the number one threat to US Infantrymen". Mainly as any larger vehicle that will jockey to reduce the likelihood of taking effective enemy fire is dangerous -- the vehicle commander is generally not going to be in the open hatch looking around if there is direct and indirect fire coming in. Now vehicle SA systems have come a long way from 2003-2006, but large vehicles are still a threat (even if friendly) to dismounted troops.
We have IFF beacons on helmet to avoid fratricide - and individual positioning now as well with some comms systems - so there are ways to introduce SA to the vehicle crews to watch out for "crunchies".
Quite frankly no western army really knows how bad it will be in an LSCO for AFV crews as the ability to ride hatches open will be totally removed - the CC riding head up to find targets and look around is fully removed - AFV's not having advanced Commander independent cupola sensors will be severely degraded. As well in a non EW degraded environment there will be a mass of data input as well which can be overwhelming, I suspect this is the reason that some AFV designs that use an autoloader have a 4th crewman to manage non direct features SA and other data.
Now if you look at the Stryker - it is really a battlefield taxi - there is no intent to assault positions (at least in an LSCO against a Peer/Near Peer Enemy) with the Stryker's - it disembarks the dismounted troops outside of engagement range (which sucks in an artillery saturated environment).
The Stryker's have some support weapons via RWS (Mk19 GMG and .50 M2 or GAU-19 if SOF Stryker) but those are generally more of a self defense weapon system than an actual firebase for the attack, unless it is a very limited enemy in terms of size and weaponry.
So for the APC role, the 2 person crew (driver and CC) isn't as limiting as it is to a vehicle that is expected to interoperate with other AFV's and dismounts on the battlefield.
Where I get confused it where is the LAV 6.0's role on the LSCO battlefield. Because it is neither fish nor fowl.