There are some differences in your examples:
G43 changes the role of grenadier from static long range to mobile far to mid oriented
5 men upgrade is simply superior to Lmg
and ppsh if for assaulting while 7 man is superior at holding ground and economizing manpower. both have applications where they are better than the other
My suggestions is to keep both XP and reinforcement discount. The discount particularly would help PPsh have reduced bleed in late game.
it wouldnt be an exclusive upgrade? not sure i like that... ontop of your 240mp cons you would then have a 20mu upgrade tacked on and the 80mp/10fu for molitovs and 125mp/ 15 fu for AT nades... all for kitted out infantry that wont be able to stand up to infantry armed to the teeth and battle hardened AND wont even have their merge utility to reliably fall back on
plus reduced bleed on ppsh cons wouldnt be a good thing, it doesnt need that buff, it would make it far more attractive and a no brainer where currently even with a ppsh commander you will likley be mixing 7 man and ppsh cons
the 7th man strengthens cons where they should be late game, which is bodies and volume of fire and simply 2mp off a head and some faster vet wont make them much better than they were before the 7th man was added.
That is commander design issue. Actually the game should have abilities of different power level so that total power level of commander are about the same.
i agree there should be different power levels to better balance commanders, but HTD isnt worth a whole slot and every singe commander that had it was underwhelming. the soviet commanders are ina much better spot with them merged. some abilities just dont stand up the the test of time and the doctrinal power creep that comes with it
From my point of view combining a defensive ability like "hit the dirt" with an offensive one like PPsh make little sense and should be avoided.
(actually I would rather have hit the dirt replace ourah for conscripts solidifying them as a "defensive" infatry and ourah moved to redesigned penal solidifying them as an "offensive" one but that is just me)
i dont see the issue with the ability granting offensive and defensive traits since they are exclusive to cons and as said before the goal is to make multiple paths attractive at the same time. HTD doesnt synergize well with the ppsh of course, but does with 7 man cons and any cons you planned on holding out on giving ppshs to turn into 7 man cons. call it "conscript equipment and training" for all it matters.