Ober's timing coming too early is not really as issues as long as they remain less cost efficient than penals. Imo it is the other infantry that should be delayed not ober that should come earlier.
Hezter and ostwind should not require the T4 building to exist.
Their timing could be fixed with CP.
Either all call in tanks should require both CP and tech or the double requirement should be limited to only to Super heavies.
I get your point but right now balance wise I think elite infantry is in a good spot. Now we have more Shocks,Storms, Pgrens and new builds with mixed army compositions. Delaying would require changes to timings, scaling and unit cost just to match the balance we have right now. Too much work if you ask me.
Also falls are arriving earlier now, and I'm sure we'll see adjustments to Paras, Commandos and Rangers if needed. That's the design choice the balance team made and it worked great so far.
I agree the timing for Hetzer and Ostwind isn't the best. But I haven't tested those units yet so I'm not really sure.