>The fact that there are whole industries built on training these puzzles is a big signal that you're wrong.
Wrong about what? That they are easy? If you know binary search, sorting, sets, hash tables, recursion then it is easy. If you wanted to make it more aligned with what a developer does day to day the alternative is doing a small project in your own time which is more time consuming for everyone.
Leetcode "easy" questions are just common sense application of everyday algorithms and data structures. These might make sense for an automated screening test of "is this candidate lying about knowing the language".
But, then there's the ones that are all about specific techniques such as dynamic programming + memoization, or specific graph algorithms etc, etc. Any decent programmer can learn how to do these harder problems under time pressure (interview) through practice, but this is really about Leetcode grinding prep... these are not problems you would likely encounter in most jobs, and in the real world you'd just Google for algorithms or ask a colleague if you needed help.
Wrong about what? That they are easy? If you know binary search, sorting, sets, hash tables, recursion then it is easy. If you wanted to make it more aligned with what a developer does day to day the alternative is doing a small project in your own time which is more time consuming for everyone.