Jason Ladayne is a great example. His card control is unreal: https://www.youtube.com/user/CardMagicByJason
https://m.youtube.com/watch?v=z7InE1zXAY4&pp=ygUfcmlja3kgamF...
He took on a young "partner" (mentored a student, but without admitting it), and presumably taught him much in his last years. Hopefully nearly all.
The foundations of card magic are certainly out there, and for me knowing how the fundamental slights work make it that much more magical to see it performed at such a level. No different than having played a sport makes spectating that much more interesting and appreciable.
I've seen other famous magicians live and up close you can catch move or notice things but he was pure skill.