I disagree. A 20-30 min interview that filters 37% of candidates (for his case) while selling the company to the other candidates is the most effective intervie

I disagree. A 20-30 min interview that filters 37% of candidates (for his case) while selling the company to the other candidates is the most effective interview in the whole interviewing pipeline, saving a lot of time downstream. The alternative is to do basic filtering within a more expensive interview, ie to include basic salary/visa requirements while doing a "regular" interview, then for bad candidates you either cut the interview short (effective but rude) or go through the interview wasting everybody's time.