Giving units new roles is the entire purpose of the usf-versatility over raw power.
Sherman's can change shells and act as a smoke mortar.
REs with lmgs can act as HMG teams.
Riflemen with Zooks are the only at snare+at weapon squad ingame.
Taking medics out of ambulance and inserting res inside
Resigning captain to focus production duty lategame
And so on. If anything, support weapon racks (which mechanically I accept can't be implemented) would build on the U.S. theme of utility and versatility, while also adding more strategies to the faction and buffing debatably the weakest support weapons.
There comes a point where versatility means you can use certain units and abandon others meant to fill that role.
Your list is about versatilbity, but not new roles. They change their nature, sometimes permanently:
-Shermans can switch shells but aren't great at either role. You do not spend munitions to make them better at their AT/AI job besides the pintle upgrade, which doesn't swap for anything.
-REs with the M1919 can act like HMGs, but you need to use a RE squad, spend munitions for the LMG, and utilize them for combat, and of course choosing Infantry Company. Once you do this you're wasting your resources if you use that RET for anything else, so it's resigned to be an HMG supplement.
-Captain first needs to risk being in the front leeching XP before it can really make a difference with production.
-Medics cannot replace RETs.
As you can see, there are costs to the versatility. But what costs do you have if you can outfit an AT gun with BAR or LMG? You are giving them new roles with nothing but munitions expenditure. You won't see RETs with LMGs if you can simply spend the same amount of munitions to AT gun and performs the same job as well as antitank. That's not the sort of versatility I see in USF units, nor do I expect that to be the sort of versatility Relic envisioned (but really who knows #Reliclogic)
Versatility needs to come at a cost. IMO the only good justification with outfitting pickups to HMG/ AT Gun is if all factions can do it, but this obviously wouldn't benefit USF since most other weapons from other factions perform better; four Racketenwerfer units each with LMG34 sitting inside Ettelbruck train station anyone?
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