[...] In regard of designing 2 factions (WFA) lacking of support weapons, Relic gave them FRP. But also because of lacking of support weapons those 2 factions are design to spam a generic unit. [...]
Yes, exactly! That's what I was thinking, too. It's a bit off-topic, but think about it: A player often wants to combine several units against enemies he encoutners. When the faction has access to many (viable) support weapons, you can combine support weapons and normal infantry units. That
will inherently look more strategical and well executed. When a faction has mostly access to infantry units, but only has few (viable) support weapons, there is few choice but to combine mainly infantry squads. And that
will more often look clumsy and not well-executed. It can leave a bad taste for both the player and the opponent.
What you mentioned here is really a basic problem of OKW and USF. No matter what they do, the absence of support weapons will always leave a bad impression, as infantry heavy tactics just never will seem as sophisticated as a combined approach of infantry+support weapons.
(The use of the support weapons of the WFA factions should just be encouraged more. As in, make the .50cal more attractive; Also, OKW could use a non doctrinal HMG or the Kubel could act much more HMG-ish than it does now.)
Sorry, I couldn't resist going a bit off-topic.
Anyways, I still like FRPs. If necessary, they surely can be toned down or adjusted without removing the feature which would be plain boring.