REs just got nerfed... their reinforcement cost as much as riflemen... bazookas is a side upgrade that prevents teching up to say an MG or light vehicle... limits build
Guards is doctrinal... that limits commander pick
conscripts and AT grenade is a side unlock again... limiting builds
mines require foresight and depends on enemies' actions.
Shrek spam is a more versatile AT option since it can be re used and is mobile, AI, and grenade.
I do not see OKW using sturms to spam mines everywhere... just shrek spam.
If you're talking refusal to adapt... why don't I see players not get shreks? that would be a first.
Currently 15 wins/0 losses as OKW
All that you mentioned here above are options and not limitations. These options helps you to adapt and react to what your opponent is doing.
If you picked T1 build with penals and sniper, you pick the molotov upgrade right from the start, and so on, while your enemy rusehs a PZ 2, that is your choice.
And by the way, sturmpios can mine now because OKW has a proper amo income. If a player use amo just for shrecks, just for mines or both, is his option.
I see no problem here.