They have clearly explained the change on stream.
They will not change anything back.
L2P issue, they are mid range unit, not SMG CQC one, use them from cover at mid range.
Before, the best use was in cover, efficient from middle to close combat and still doing "some" damage from far distance, while being in cover all/most of the time.
L2P means now to learn using them as shock troopers - aka no brainer unit - closing them to hug distance in order to kill efficiently.
What I cand tell you about this is:
1 - STG 44 is not a SMG. It's an assault rifle. It's stupid to impose sturmpios to be used in this way.
2 - If Relic wanted them to be used in this way, they should have modified the values that grant them a more efficient defence. The received accuracy modifier it's not enough.
3 - They are an expensive unit. In addition, takes alot of time to reinforce. So, there is a verry big contradiction between their highest efficiency range and the way they should be used. I mean: before, because to reinfoce them was costly and took forever, they where used from mid distance alot and even from far distance in order to minimize losses. Loosing to quickly 1-2 models from squad was not the way to play them because of facts presented before. Now, while none of these facts changed (reinforcing time and cost), I am obliged - in order to have the old efficiency - to close to my opponents troops at face punching distance, loosing models at a higher rate. Suddenly, I can tell you frankly, they don't worth it.
The result: If you are playing without additional units like fallschirmjager or jager infantry, that means untill T4 you will have no efficient AI infantry which is verry bad agains early allied blobbing especially now when mg34 was toned down alot. That shouldn't be a problem for Ostheer, but OKW has the fuel problem and it cannot compensate through AI vehicles like sdkfz AA in the same manner as Ostheer. Any vehicle build, equals to donating an organ. Costly and with consequences in future (Bad consequences if you have bad luck losing it quickly or if you build the wrong vehicle).
That is the problem actualy. Sturmpios changes are contributing to overall okw infantry handicap increase which, in my view, is highly unrecommended given the resources situation.