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I would be comfortable saying this is an amateur's mistake. An observant mechanic at home or in the shop should be able to see and understand the correlation between these adjustments and transmission fatigue after the first broken shifter, cable, housing, ferrule, etc. I think it's always best to leave just a tiny bit of travel past the click, but you have to be careful not to leave too much. That's one reason why it's nerve wracking to send a ham-fisted beginner out on their new bike - the same person who reefs the derailer past the gear is also going to keep pedaling hard when the chain starts to wrap around the back of the cassette.
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