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The impulse to blame the "kids these days" seems like an ever-present forceLamenting a lack of experience with arts and crafts and similar sounds more like an "education these days"-complaint to me. If children do suffer from a lack of trained motor skills it is not their fault, but it is something to take seriously, for their sake more than anyone else.
Also, I dunno waiting for a proper study is worth the risk. It would take quite long, which means that if it is a problem we already screwed over a generation. Plus, people complaining about a lack of physical education these days is not something limited to surgery.
Taking physical education more seriously as being important for general development, and not something just for the people who want to continue in sports is probably beneficial for everyone in the long term anyway.
(tangent: I wonder if these students would perform better when handling robot arms with a control stick than previous generations)