I was a decent developer and a much better manager, and I think a big part of it was I learned these are different games. By the time we hit multiple dev teams I had good success framing it wtih senior ICs like this: "If you want to get 10% better (better in context of what they are defining) this year, that's really, really hard. But it would be easy for you to make everyone on the team 2-3% better, and our net improvement would be well over 10%." We then talk & plan relatively straight-forward ways to make this happen, and mix in explicit personal improvement/growth components. They're motivated, they make their teammates motivated, they make me motivated. Meanwhile the 10x'er (not sure I've had one of those) keeps grinding it out in the minor leagues.

You share that with no justification. There's no such "reason".