Earlier quoted context omitted.
In my experience it comes down to two things: 1. People think they already have the fundamentals 'down' 2. Actually mastering the fundamentals can be boring and make a game feel like work (which, if you don't truly enjoy pushing the limits in a game, it is.) A totally random example from League of Legends. 99% of players go into game after game and literally never review their previous games. They will spam games but…
How much of this is data-driven? I mean, every shot can (in theory) be digitally logged and analyzed. Is there anyone doing a Moneyball-style player performance data analysis service? I hate to use the term, but an "AI coach"?
It's pretty hard to go straight from DATA -> ACTIONABLE COACHING DECISIONS
It's much easier to go from COACHES INTUITION + SUPPORTING DATA -> COACHING DECISION
I'm not aware of any other coach (but there probably is some) that has the technical skills to build the kind of tools that would be required. Bear in mind, most games don't actually give you all the data you'd want to look at. That said, there were a few folks who made a killing in esports betting for a while.