alt Hacker Newscode didn't matter even before LLMs. we only ever cared about the product of it.
the current pace of LLM advancement only has to keep for five more years for handmade code to be considered a liability. I wouldn't worry about being able to recall obscure APIs or whiteboard leetcode. I'm far more worried about having to change careers at 40.
I've seen the result of "code doesn't matter" and it's difficult to change and maintain. I guess if your business is ok with frequent P1 incidents or ships a complete product and never touches it again, but I've never been part of one. I've also never been in a position that cared about leetcode or remembering APIs, so it's possible my experience is completely different from yours.