I'm gonna weigh in on this since I played a couple of games on the beta version already.
However, please keep in mind that I am talking about the low to mid-levels of play here, so take my opinion with a grain of salt.
That being said, I personally think the Sturmtiger change is fine. It allows the propaganda doctrine to reinforce anywhere, without having to rely on a building to upgrade to a forward HQ. While I recognize that halftracks can also fill that role, I still very much like the Sturmtiger having a purpose other than firing a rocket every 5 minutes.
From the thread, I can tell that people take issue with both the tanking capabilities of the Sturmtiger and its debuff aura.
I personally don't think that the debuff aura will cause too many issues. If you look at the flow of how propaganda plays, you can see that the aura only realistically comes out after 12-14 CP. This is rather late into the game, and most people will have a normal Tiger fielded anyways by the time you unlock the Aura.
The tanking capabilities are something you can look at. The Sturmtiger's purpose (as far as I can tell) is to take out heavily fortified positions.
Since it has a lot of range, it does not need to be able to take any hits in order to perform that role. Catching it out with infantry or a 76er should allow you to take it out. I would not mind making it cost slightly more, just to make it more punishing if you end up losing it.
On the other hand, even if it is very tanky, it does not really do anything. After it shoots you can basically just ignore it and walk past it.
The video illustrates how little it does in an actual game setting, even if it is super tanky.
I would move to reduce its armor and make 76mm guns a threat to it from the front.
If you think it is stupid to deviate the armor profile from its historic values, please refer to the previous posts about realism.
Quality of life changes and utility buffs have always improved underutilized units in the game. Right now, the Strumtiger is only a "win harder" type of unit, rather than an actually have course altering effects on the game. Therefore, it should receive all the love it can get.
Side note:
I would rather have a look at the nasty Stuka zu Fuß. Which is a real pain in the ass.
I say this post as well, and I can't help but agree. In my opinion, you should even try to swap the Stuka and the Strumtiger unlock. That way, you'd have a clear "break the line" theme for this branch.