221 should be in the game and it should actually be also available for Ostheer.
It should server as a counter to allied cars like the m3, UC, WC51.
Reducing shock value of these vehicles to zero?
Ost already has faust from the very start of the game specifically to keep early lights at bay and same with OKW and puppchen(like it or not, that's intended counter, I had used and had used against meeffectively puppchen as 3rd or 4th unit to counter M3).
You want to counter them, wait for 222.
Why some units should be completely irrelevant from the get go?
Why would you NOT want to rush 221 as ost in every single game, when allies have absolutely nothing to fend off or even deter from pushing non support light?
Why ost and OKW should have a vehicle that can effectively dive in and chase without any fear of AT or snare?
Are you up for giving all 3 allied factions T0 tech and vet free way to field AT or AT nades from minute zero, so the counterplay to that 221 of yours exists?
Try to see at times something beyond "axis unit up, allied unit op" please.