I'm not so bold as to propose I'm a master yet, but I've definitely hit a patch of "these problems are plaguing the industry and lots of smarter people have not managed to fully solve them yet."

What's been fascinating is I now have sufficient perspective to have thoughts and hypothesis of how to approach solving them, but the experience to have a sense of where I'll likely hit walls.

In the case of business it gets interesting because in many cases, if these problems have been solved, there's vested interests in making sure nobody else finds out how you did it, so these may actually be solved by some companies already and I'll never know.

Nor might we know when a teacher or mentor is communicating something textbook vs. some non-textbook insight or new idea.

Doesn't mean I don't hold a strong view on some subjects, experience has also solidified things that time has shown as essential.