LeetCode was never about LeetCode, it was always a stand in for culture.
It's now a signal for baseline compliance. That's generally good for companies that require mostly operationalists.
The problem is that anyone can learn to leetcode. If you're interested in doing something new and not just warehousing CS lawyers, you're gonna have to ask better questions than that.
I do feel like functional programming reached peak hype over 10 years ago. LtU barely seems to work at all anymore.