In my irrelevant opinion, any event for which the result is decided by a panel of judges is not a proper sport. Too much room for subjective opinion, interpretation, did they see everything properly, open to bribery, politics etc… I don’t believe anyone can be 100% impartial and objective in these situations.
Whereas stuff like running, throwing, jumping and so on it’s clear who’s the best when you’re measuring against a clock or ruler.
The only variable to deal with is doping.
And while I’m at it, if you’re not physically exerting yourself you’re not doing a proper sport either (shooting, archery, dressage, etc)