It's not just tech...
Speaking as a parent who takes his daughter to guitar lessons every Saturday morning, and for at least the first 4 weeks we were there another parent brought his son along, but didn't seem to feel it necessary to actually bring a guitar along too...
So sadly I have to report that it's not just tech that suffers from such people, although the look on the tutors face by about the third week of it happening despite his repeated hints, prompts and suggestions to get one was priceless..