Strongly disagree if we are talking a complex problem like coding a distributed system. It is very possible for an implementation to be 90% correct but it won't compile or it's wrong for very subtle reasons. And maybe if there was another 30 minutes it would be debugged correctly but it didn't work out in the 45 minute interview period. There is signal contained in the 90% right attempt that can show a lot of knowledge and skill which you'd be missing out using autorejects.

We are not talking some CRUD app where it is trivial to make each component work or a Leetcode problem that you can spit out in 20 minutes.