Giving Sturms 2 shreks isn't going to make shreks any less of a problem, you will have a starting unit with them. You could give a totally new OKW starting unit shreks and the same issue would exist.
The reason the shrek exists for OKW early game is that OKW specifically lacks fuel based AT, that's it. There isn't some out the ass complicated justification for shreks existing on a starting unit, it's clear as day. The first dedicated anti armor platform you can build is at a 135 fuel at reduced income from a HQ you need to build. And making said anti armor platform robs you of other options.
KT isn't the root of OKW's problems, it's just exacerbated by the fact that you don't have much between the starting units and a KT that you need to build or can build. Most games a OKW player will be forced to spend fuel in order to say alive, and they will have to spend it wisely. The whole saving and delaying for a KT puts OKW in a hard spot because they will be lacking vehicle platforms to counter the numerous mediums and other vehicles allies can produce.
As long as the fuel penalty exists people will always be extremely picky with what they make, and they will make game winners not game changers, get what I'm saying?
Yes it is, because it will stop blobs.
I though that Puma is cheaper than Jadgpanzer so why you sau that first unit is Jadgpanzer?
Puma can hit the field in less than one minute after M20 so what's the problem?
Not to mention that in 1v1 Jadgpanzer can hit the field in 10-12min to fight against Sherman/T34 so where is this lower fuel income and lack of AT?
KT is the problem. This unit should be doctrinal. It's like giving SU non-doc IS2 after 3 tiers so you can pick up doctrine with B4 and combne it with IS2, sounds OP?
Now, since OKW is floating with manpowerm it's not big deal to make KT and cover it with Pak43.
I did it countless times. I even help my enemy to flank my KT so my Pak43 can snipe his tanks.
KT+Pak43 - the biggest OPness.
Let's wait for a OST doctrine with Pak43 and Tiger Ace, it would be excatly the same.