After being a professional programmer for ~20 years, and recently playing around with leetcode - my main issue with leetcode is that there's almost no overlap between leetcode problems and the problems I actually encounter in the wild. The validation tests often have silly corner cases that force you into a single answer to avoid timing out. It's frequently as much work to understand what the problem is actually asking you as it is to implement a solution. Just like I've found ChatGPT to be pretty mediocre at writing the sort of code I work on, but others swear by it, maybe some peoples' dayjob actually looks like writing leetcode all day? I know a lot of interviewers use it, but it feels so disconnected from actual engineering work.