Don't try to reason with them copers.
I agree, how dare someone post an opposite opinion to yours that is clearly 100% right... Your comment tries to shut down any response before its even been proposed and just shows your true bias. Anyway.
At the end of the day, the OKW mech repair speed is greatly related to the fact that you have only one engineer squad who has to do 20+ jobs. As overpowered as it is, as fast as its repairs are, as incredible as it is at mowing down Ivan/Nigel/Yanks, it is still only one squad.
If you only get one engineer squad that's on you, take UKF sappers as a comparison, they are a flamer/piat squad, barbed wire, salvage, building emplacements, tearing down emplacements, building caches, snaring, blowing up cover, planting mines, defusing mines, repairing.
How is that any less than what the OKW pios do? Early game they turn engagements, they can put away their sweeper giving them back 1/4 fire power. What exactly do they do more of than any other engineer squad?