It might be useful for sourcers and recruiters, but the interviewers never look at your Linkedin profile.
An interview is only one day with a candidate, and we’re well past the point where our functional questions are contrived to the point of selecting for interview training rather than job skills.
Consider that 8 years ago asking to reverse a singly linked list in o(1) memory and o(n) time was the difficulty bar for FB. These days you’d likely get asked to implement an optimal multidimensional DP + dfs/bfs/bsearch.
Do one long test/on-site equivalent then everyone can just share their trusted results. Its like the SATs for dev jobs.