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Racks have their upsides and downsides. Also consider that adding up to 3 additional upgrade buttons for every single USF infantry unit would be a nightmare for Relic. Especially true for units like REs if you go Infantry company, as they'd need a second row.
You can afford to send units back to base for weapons. Mass retreats happen in the first place, and if you're able to hold a forward operating base, then you can afford to send single squads back for a paltry amount of time. Tying the need to go back to base with versatility is completely nonsensical.
Above all, don't fix what isn't broken. (Front-facing racks on some maps would be really nice, but that's about it.)
I dunno why people like you are using dual equipping as an argument lol. You realize that your units have a higher chance to drop their weapons when they dual equip? Not the mention 1 panzershreck > 2 bazookas or 1 mg34 is as good if not better than 2 bars. A gren squad can upgrade lmgs for 60 munis. Rifles need 120 munitions just for the bars to be effective. 1 bar boosts the dps of rifles by a very minimal amount that it's almost not even worth it.
The only good thing about the weapons rack is that it's a universal upgrade so that any infantry can grab it... except the only unit worth putting it on is rifles. RE's don't scale well with their vet, Paras already have lmgs and thompsons. Both Paras and Rangers have x4 thompsons for 90 munis. You seriously gonna give them bars or bazookas?
Basically you're an idiot if you equip bars or zooks on anything except rifles or re's. And if you put zooks on rifles you've just gg'ed yourself because they won't do anything against grens with lmgs or obers. It wouldn't be hard just giving RE's a zook upgrade and Rifles a bar/lmg upgrade. So don't exaggerate it like you'd need to put additional upgrades for every single infantry.