I can't agree with that. I don't see point of a filter question if its not a separate step before the full interview. If you're going to bring someone in for a proper interview, go ahead and give them a full interview session. It's weird to put a filter a question into a full day's worth of interviewing.
And I can say, having seen hiring practices across tons of companies, filter questions are almost always a separate step where candidates have a tendency to fall out of the hiring pipeline.
> Even if this is about the phone screen and not a filter question per se, I'm still not sure I really like the idea of omitting phone screens for more senior positions because you might lose on "better" candidates.
Phone screens are fine because they're usually more about culture fit and trying to figure out if the candidate and company are right for each other. Experienced candidates that get asked basic technical questions on a phone screen have a tendency to report a negative experience and not have a desire to move forward with the company.