That might have been the initial purpose of whiteboard challenges, but I don't think it usually works out like that. I can't speak for the person you're replyi

That might have been the initial purpose of whiteboard challenges, but I don't think it usually works out like that. I can't speak for the person you're replying to, but most people I see who object to whiteboard interviews are upper-level developers that haven't needed to know any of the common whiteboard challenges off the top of their head-- like coding an efficient merge sort in C with proper memory management-- because it's rarely a useful skill in day-to-day work unless you're working with that stuff directly. The people who know that stuff are usually recent grads and people who grind leetcode-- all people who've worked to memorize whiteboard type trivia rather than honing more real-world-applicable coding skills.