There are plenty of opportunities for a ground run to go wrong, the Robbo isn't any different.
From the collective creeping up, accidentally disabling hydraulics on that silly switch to getting caught out by the governor engaging (if not set to manual).
Not having a qualified pilot at the controls of an aircraft running at flight RPM seems like an accident waiting to happen.
Robbie pilots can't be in such short supply to justify this approach.
One very lucky technician, one very annoyed owner.