So you're going to promote a copy paste bunker for the Soviets then Alex? this inst a Nerf of a buff its adding something to another faction that was designed to have defenses, and the Russians got the bombs to blow them up. So if you want Maxim Bunkers with he same fan as the Axis bunker to get an equal damage demo, bobs your uncle ill jump on that. But you'll find some argument that it doesn't work at way anyway. You want a free toy, like your Cache suggestion of OKW, no penalties for a buff, your logic is not RTS logic. I can see OST with demo if Sovs get bunkers, OKW does not need Demos with the mighty Stuka and Sturm around.
Except that
1. Soviets have a plethora of indirect fire to deal with bunkers, Ostheer and OKW don't doesn't.
2. Soviets don't need bunkers
3. Demos are not bunkers, one costs manpower and munitions, the other costs just munitions
The stuka isn't a blob counter, it's a support weapon counter. For killing moving enemy infantry it's an utter waste of time thanks to the long barrage cool down and how easy it is to avoid.
The best blob counter OKW has, but at an insane 242 fuel is the Sturmtiger (adjusting for the reduced income) it's a very hard sell considering how much you need that fuel to put into a Panther or JPIV to deal with enemy armor.
The point of giving the demo to everyone is to make it more fair, but as LeYawn pointed out demo's are super easy to use and a pain in the ass to get rid of while negating the unit preservation dynamic Relic desires so it might just be prudent to remove them from the game.
Allies blob just as much as Axis does, both should have equal tools to deal with it; problem is that almost all the tools are sitting with Soviets.