I have Unified routing enabled and have a basic routing rule setup as well (I have a client that has a lot of basic routing rules that will be converting to unified routing). I cannot get the basic routing rule to work with unified routing enabled, but haven't found a concise answer that this is expected behavior. Also with advanced routing rules via workstreams, I don't see that we can any longer assign a record to a user/team like the basic routing rules would do.