This disussion reminds me, the auto-assistance cutoff is not taking into consideration that repairing is 10x cheaper than constructing.
So those mercenaries, while may be 400/s to build at base constuction rate, only drain 40/s at base repair rate.
Fixing this would also fix all sorts of other problems, like home command stations not being auto repaired under sane auto-assist cutoffs.
However, this would make broken golems harder to control, as you repair them, not construct them. That will need to be looked at.