It's really funny/strange how early promise flourishes, or doesn't. Felix has all the ingredients, and top-tier coaching.
I've really come to feel that a huge part of it is mental - specifically, how badly you want it.
I was thinking about this with regards to a baseball. Anthony Rendon is a player who the Angels signed for a huge amount of money before 2020 (about $35M/year through 2026). He was healthy and good in 2020, but has been mostly injured since. He's got a blase attitude which some interpreted to him just being a cool, mellow guy. Others complained that it seemed like he didn't care. There is a recent "insider" rumor that he hates baseball. If true, this makes me think that the odds of him coming back to something close to his peak level (2017-20) are close to nil.
Here's why, imo: pro sports is played at an extremely high level and has tiny margins. Every little edge counts, and to play at the very highest level, you have to be extremely dedicated and work hard. You can't fake it. In truth, I think this is one of the main factors in the Big Three: they all have/had enormous drives to succeed (as well as the resources to support that).
None of that is particularly new, but I think it is a good reminder that
might explain at least some of the young talents that disappoint. How much do they really want it? Fortunately, tennis doesn't have a salary structure like baseball, where you can sign a huge contract and then just coast for the remainder -- like Rendon, who makes his money as long as he doesn't retire. I suppose the tennis equivalent would be those players who are content being journeyman and making a good enough living doing so. But the guys who rise to the very top and stay there are probably always the guys who want it most
and have the talent.
Obviously drive can only take you so far. We can see someone like David Ferrer, who probably maxed out his talent as much as humanly possible, but was never good enough to win a Slam (largely due to the unfortunate timing of his career). We can contrast this to Vitas Gerulaitis, who probably could have done more if he made different lifestyle choices.
This
might be a factor with FAA. I honestly don't know. But I think it is a common factor in a lot of players. And related to it, is how a player responds to adversity - whether they keep fighting, again and again.