I used to think this was true in skateboarding but eventually I found exceptions.

4-5 times / week is not a lot on its own.

You need like 20-25 hours / week. That’s how many actual hours a lot of us kids were spending, at least skateboarding.

If we take the 10,000 hour figure literally, at 20 hours/week, you get good in 9 years, which kind of fits when kids get good.

Almost zero adults I know can (or are willing to) spend 20 hours/wk on a physical hobby.

It doesn’t mean you shouldn’t learn something new, but you gotta be a little strategic.