1. OKW has a repair problem as only expensive sturms can do it outside the base.
2. OKW has a mines problem as only expensive sturms can sweep so OKW often loses expensive, often elite, squad models to mines when sidecapping, for example. They can't build such expensive units just for sweeping when other factions can pay as little as 170 - 210 mapower to do the same.
3. OKW has to repair their truck and again only expensive sturms can do it. Agin often they are to busy to do that or simply bleed too much when barraged doing it.
Such solution would solve those problems and allow OKW to bleed less manpower to mines (or when they need to replace the lost sturms) and also give a bit more field presence to their tanks/vehicles. It is possible that a bit less manpower bleed plus more field presence for the vehicles will actually buff OKW more than You expect.
Those same expensive sturms are pretty OP in the opening game, if you lose them at start, that's your problem. OKW also has repair drones so...
Same as Soviets and USF, CE and Echelons can only sweep. Again, you get one at start, so you're not paying anything. While other units are less expensive, they are also much less combat ready.
Your trucks will get barraged if you put them close to the frontline, again, your problem.
You want to put volks with repairing? So, OKW, which has the best tanks in the game and non doctrinal super heavy would also have spammable units early on to fight and later on to repair. Basically you could play aggressively with the tanks knowing that you will have a super fast repair.
Get a grip with reality achpawel and play some custom games with allies or become better with OKW. Get a grip.