1. OKW schwerer is overpriced for this "advantage"
That is cool but untrue-schwerer flak is completely and 100% free. The only cost you pay is the tech cost.
2. its to fragil and there are much more option to kill it....more than before 4 years ago (more fractions, more commander, better callins, better TDs, better arty, etc)
Its most durable structure in the game, literally ALL off maps that threatened it were nerf hammered, the only single Option that exists now and did not 3-4 years ago is USF mortar, so you are wrong again. All TDs are LESS effective against it then they used to be at the time and arty Performance against it is much worse since precision strikes were removed.
3. OKW lakc ressources income compared to other fractions because of no caches ...and when you look that the whole OKW was nerfed and allies was buffed...there is no more resoans for this "no caches allowed maulus"
In Team games you have allies, in 1v1 no one builds more then 1 Cache if any at all, if you salvage wrecks you will get as much as you would get out of cache.
OKW was also overpowered for literally years and lets not pretend allies didnt got any nerfs.
If you can not protect it, place it in your base.