2) again, see 1)
3) they don’t need to remember everything about all algorithms and data structures, just like lawyers don’t remember all details about the law either. that is what books and the internet are for. you just need to know what exists and where to find it, and should have implemented some of it in your career and while in college.
4) i think that that is a typical mistake made by managers and HR. it takes years of work to enter a particular niche and gain experience in it, and it’s unrealistic to think you can just quickly train someone on the job. apple is the example here - most people there are highly specialized in exactly one thing and have long careers related to that.
passing on experienced people because they don’t care about your stupid binary tree trick question or are just tired of going through another leetcode circus act is a costly mistake - there are only a very limited number of highly specialized people available in the market, and it is these people who will make the difference between a “meh” product and something truly incredible.
hiring is broken and will remain so until the coding interview bullshit is replaced with something better.
