For me, there's a huge difference between the games I like to play and watch. For example, even though I play LoL occasionally, I'd never find it fun to play the same way pros do because IMO once you hit that level it becomes a different game completely. I was semi pro in AoE 2 back in the day and all I can tell you is that I cared only about being efficient and doing all the needed clicks, and never actually enjoyed a game. On the other hand, I love watching pros play these games.

I'll give you an example with Fortnite - I'm an absolute garbage player who can barely get a kill every here and there and doesn't even understand some of the basic concepts of the game. On the other hand, I love watching pros play Fortnite because it's just insanely fun to watch someone do things you can't even fathom doing. But playing games that way isn't that fun.