Please stop the coding challenges

So we should stop the coding challenges, stop LeetCode, stop whiteboarding, stop profiling candidates, stop asking for their GitHub page. How is hiring supposed to work then? Just post the contract online and the first one to mail it back gets the job?

I like live coding challenges, something like a ~2 hour pair programming session, ideally modifying an existing project. I invest as much time as each candidate, while we are both exploring whether we want to work together.