Cause there was always something to abuse. First there was techless CommandPanther. Just go Puma+Stuka into Panther while you have to pay no fuel for T4. Then there was the owerpowered CommandTiger (timing, performance and price). But since both things got adjusted OKW has not much to abuse (besides maybe Radio Silence vs Tac map player) and you see the flaws they had since the rework. Having costly healing is no problem as long you have other positive things that overshadow this.
Currently both tech paths are equally viable, but it feels kind of lacking like the old USf tech structure. If you want to go puma for lights or stuka vs support weapons you have to do without indirect fire and healing. If you want healing and indirect fire you have to neglect rocket arty and a (more or less) secured light vehicle phase.
This on top of weak mainline, no groundbreaking commander and a strong counterpart (Ost) makes OKW kinda negligible. But the question is if you want to put every faction on OST/Sov level or just nerf the eastern factions.
Or in addition OKW has been powercreeped by the buffs to allied factions.
Patches tend to buff things more than nerf them.