Imo the requirement of having a Schewerer Panzer headquarters with Panzer Authorization on map to have access to the doctrinal units is should be fixed. This is problem especially in 3vs3 and 4vs4 where the CP gain in longer and the shire volume of artillery can delete OKW easily.
If one is not willing to remove the restriction at least make the requirement of Panzer Authorization a one time requirement so that if one loses the Schewerer Panzer can replace it without having to unlock the Panzer Authorization again.
Before Panzer Authorization was introduced you had to pay the full price (120 fuel) to replace the Schewerer Panzer headquarters. It would be a massive buff, as you would regain access to medium tanks much easier.
The Panzer Authorization system was only introduced to make obers more accessible... (and tbh, I don't see it being used much, obers without their lmgs just doesn't worth it. /offtopic)