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I can understand their concerns. With the older Meades it was a big problem. I have to use a mid-90's 16" SCT at Perth Observatory and there is no way you want to play with the original focus once you got it right, it was that touchy. Now it has an electronic focuser on the back and its better, but we still dont encourage any adjustments with that one.
Personally, I prefer not to adjust the focus unless someone is having real problems seeing anything. Most people seem to manage with the set focus, I've found.
I have had one interesting experience with a teenager who got a serious shock finding out how bad his eyes were. The focuser got majorly racked out to to reach his focus point! A friend of mine reckons looking through scopes is one of the best ways to monitor how kids eyes are going but the amount of adjusting that need to be done.
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