.. However, one thing we could do is to make their tech less rigid so that it's easier to back-tech. Getting Battlegroup for just an ISG or healing is ridiculously expensive at 40-55 fuel. So what could be done is splitting up the Battlegroup like what was done with USF's middle techs;...
The creation of a need to OKW tech changes was pointed out when the USF tech revamp went forward.
If one goes down that road one will probably have to nerf these units as one has to do with USF units because these factions where designed to be played with a limited roster and units that are OP because of it.
The trend of making powerful unit available earlier is messing with pace of the game and this start to show. Many unit unit are cost efficient but do not get used simply because their window of opportunity is to small.
Imo you should start delaying many unit and increase the window of opportunity for unit give return for their investment.
In the case of OKW one could try lowering the cost for setting up T2 so that one can have access to faust at the same time but delay vehicles by locking them behind tech like repair engineers. That would also require similar adjustments to allied vehicles also.
As for changes to the cost of Battle group I would suggest replacing the medic tech with reinforcement. The BG could come with healing but without reinforcement that could become as an upgrade of bundled with FRP.