I think there was still an element of it with Clara & Smith but with Capaldi, I think a crush would of seemed wrong & to me it came across as more a father/daughter relationship.
Could it be that despite all the speculation on the who the next doctor is, this is their way of writing a Female Doctor into the role, to keep the ongoing attraction/chemistry between Doctor & companion. ( I must confess I have not watched this series yet, so could be missing something else)