Because OKW truck die easier even in base and are more expensive to replace.
UKF/USF can even repair their building at no cost if they lose them.
In addition hezter/ostwind are specialized unit and not main battle tanks that can fulfill all roles. The T4 requirement for premium mediums is fine and I guess one could redesign the KV-8 and leave it out of the T4 building.
C. Panther follow the super heavy designed and should require the T4 to be on map as other Super heavies do not require the T4 to be on map.
(I can usually tell one someone is asking and genuine question and when one is simply trolling)
I aint trolling if you think i am you are wrong this time. I was just suprised esp about the ostwind. But i put it in the med calllin catagory. I understand the reasoning behind it now.