Not in my experience. I once helped build a team of Elixir developers. There were few people who knew elixir at the time. That simple filter ended up getting

Not in my experience. I once helped build a team of Elixir developers. There were few people who knew elixir at the time. That simple filter ended up getting us a really great team-- much better than interviewing a bunch of applicants from with other language backgrounds-- the people who wanted to learn elixir, knew it, or were interested in it, were much better than average. In fact, that's the only effective filter I've found for interviewing.