After reading this post it reminded me of a similar one that was regarding the electronics lab.
Since I am Currently the steward and have put many hours into getting all the machines working as well as building the enclosure for them from scratch, it would have been nice to have been involved in this discussion instead of reading about it on the forum.
As for a rebuttal, I am not quite sure what particulars the end-user has to remember since all the specs for the printers are preloaded into cura. Also with there being so many different slicers available, The best slicer is the one that works best for you.
On the repair side of things, not one machine has required a repair except the one in which a thermistor went bad. Any machine has a tendency of people using them improperly regardless of which one they use and that applies to any machine in the shop. There would be no need to teach firmware writing on shop machines because then we would have no idea what was loaded onto them at any given time. As for maintenance, I vaguely recall Valerie asking for assistance in getting the cr-20 up and running and it hasn’t been until recently that anything has been done to it.