Bait taken.
It's not an either or issue. You can have both.
I'm not the guy to defend dress issues. Hell, I think all parades should be done in fighting order with weapons. But I do see the need and usefulness for ceremonial. Hell, even the communists fire salutes with old guns and wear pretty uniforms (note in particular the forage caps and kneeling gun drill.)
Quite frankly the C3 makes a terrific saluting gun. The round is cheap and you can train any gunner who has trained on another gun how to operate a C3 for saluting purposes in a day or two. Add to that the fact that if limited to saluting purposes only, all the maintenance issues for the gun (such as optics and recoil systems) disappear. The gun is virtually indestructible and with very minor user maintenance could be used for saluting purposes for many decades to come.
Top that off with the fact that all we need are roughly forty-four to fifty - four guns per province with maybe a second set for Ontario where the provincial and federal legislatures are separated - and we already have more than that in inventory with no need to buy any more.
Gibbs' Fifth Rule - You don't waste good.