I've seen a Chinese-built router where a lot of holes looked as if they had been drilled freehand, and the target for a proximity switch was a broken tap. Did have a locknut on it, though! And by the standards of these things, that was a fairly good router that's been doing a good job for a few years now. If that's what you find on a machine a step or two up, you realise that a few corners get cut to bring the price down. Cheaper to re-drill a stepper motor flange than scrap the badly drilled bit it bolts to?