There's a bit more to the stepper drivers (logic, current control) than mosfets (although it's fairly certain that they use them in addition), I'm just coming up with ideas - you might be able to multiplex the signal bus to the stepper drivers (direction and step signals) a little easier instead of switching on/off power mosfet (or relay?) a lot cheaper (milliamp [microamp?] switching capacity, TTL logic)
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