I see some machines with dual steppers and a toothed belt tying them together. I don’t understand why this is done. If one of the steppers is skipping steps then that needs to be fixed. Surely if one stepper skips and the other doesn’t trying to force the errant stepper will damage it?
The only up side I see is that if you manually move the Z with the motors off, it’ll stay level. So just don’t do that.