Let's be real here stuka works for team weapon and blobs if you don't use it versus blobs you either had no issues with blobs or just doing something wrong.
There is a reason why the AVRE and the Sturmtiger had the repotation of a meme tank because it is not REALLY needed.
Why would you need Best case scenario? because REALLY good players can just move their units and dodge you though this is moreso on AVRE, this is the only advantage sturmtiger has.
I really had no issue with this turret thing. They can just also buff the turn rate to compensate for the no turret thing, if everyone reallyyyy need it. Also sturm can get 5 vet making it better
The Stuka is significantly less effective vs blobs as opposed to other rocket artillery such as the Panzerwerfer (Due to the Werfer's much larger area of effect) or the Katyusha (Due to the speed at which rockets arrive on target). If you are managing to Stuka a blob your opponent is terrible, as the linear nature of the Stuka's projectiles, and the slow speed at which it reaches the target, gives an opponent more than enough time to react, particularly if you're positing that they are able to simply dodge AVRE and Sturmtiger shots perfectly. You are also required to predict well in advance of where the blob will even go.
This linear nature is what makes it effective vs team weapons, however. They are far less responsive, and you are able to place shells precisely where the weapons are (Multiple weapons, generally, due to the length of rocket's linear placement). The Stuka is an anti-team weapon platform, not one to deal with blobs.
Also, again, UKF don't have the Stuka.
The AVRE and Sturmtiger are Meme tanks not because they are not "really needed", but because they are extremely cheesy and expensive, and very all-or-nothing.
You anecdotally having "no issue" with a lack of turret doesn't mean it isnt a weakness of the Sturmtiger, and buffing the Sturmtiger turnrate simply does nothing to counter several of the weaknesses I've suggested. I hope you realise that "Five vet" on OKW units is no longer necessarily them being "Better" at vet5 than another faction's equivalent unit at vet3, right? Its primarily a flavour thing... and on top of this, reaching veterancy 5 on a Sturmtiger takes an absolute ton of XP, you arent getting a Vet5 Sturmtiger in every game. Hell, all vet5 on the sturmtiger does is allow it to do what the AVRE can already do (At no risk, due to lacking the Sturmtiger's "lol oops you got abandoned
))" if it's shot while reloading)