My head canon is always converting magic into sci fi.

Arthur C. Clarke will be by to collect royalties.

Doesn’t really explain the Snitch though, other than “they’re more about tradition than logic”.

Lots of sports spring out of a bunch of silly children’s games that get increasingly bureaucratic to sell tickets.

Why not end the game with a timer or at a certain score count? Why introduce a fairy trapped in a golden ball who has some kind of personality, rather than just being a buzzing semi-invisible toy? Why not yadda yadda?

Rowling definitely left a lot on the table.