Off the top of my head, possible problems here might be:

1. To handle trees easily you have to understand recursion. Somebody with no CS experience (and no parser experience) might never ever used recursion in anger, even if they launched zillion commercial projects.

2. No Big-O notation. Interviewers usually ask questions about time/space complexity.

And the elephant in the room is that leetcodes are getting trickier and trickier, that's LLM era for you.

> Off the top of my head, possible problems here might be:

> 1. To handle trees easily you have to understand recursion.

Well that's the point of the exercises I suggest - to learn recursion :-/

> No Big-O notation. Interviewers usually ask questions about time/space complexity

Well, that's the other half of the interview, I only promised that my method will cover half the questions :-)