I personally think that leetcode-interview-passers that I have had to work with do poorly with actually useful tasks like, writing organized code, writing tests, documenting, etc.

Probably but those are things they can pick up on the job pretty quick, while it’s a lot harder to teach leet code style problem solving while solving actual business problems.

Maybe you have a different experience, but none of the actual business problems I deal with are leet-code style. Then again, I have recently stopped calling myself a software developer (and have long since stopped calling myself a software engineer) in favor of the more accurate "software plumber". But I imagine, even coding tasks that require algorithmic knowledge and insight, are benefitted from well-organized and well-designed code. Doing that correctly is often a matter of insight and judgement, and I think often those are not "easily learned".