Just look at the PRO peloton, and yeah, that's why every racer out there is using wheels that weigh over 2kg....and tubulars that weigh more and.....yeah, that's just not what we see eh?
Actually it is changing. Pros are switching from tubulars to tubeless because Its not Aero (for gravel) and its not weight so much as it is rolling resistance.
What struck me - a pro team was blind testing tires. They all disliked the tubular tires and gravitated towards the heavier clinchers (GP5000 tubless style) because they were just faster. Sure, they might be 100 grams heavier, but rolling resistance counts.