I've been reading about expertise and deliberate/purposeful practice, starting with "Peak" by Ericcson.
Experts, as a rule, augment their practice with a coach, and they never stop doing that. The quintessential example is the olympian.
So, that is how they increase their practice surface area.
I think interest is also generally relevant, but it's not the core in established fields: coaching is.
I am interested in unestablished fields too, which may be fundamentally interest driven. Although IMO that interest may be more about establishing frontiers than the specific topic.
Experts, as a rule, augment their practice with a coach, and they never stop doing that. The quintessential example is the olympian.
So, that is how they increase their practice surface area.
I think interest is also generally relevant, but it's not the core in established fields: coaching is.
I am interested in unestablished fields too, which may be fundamentally interest driven. Although IMO that interest may be more about establishing frontiers than the specific topic.