I note these articles comment on the use of clinchers in a certain specific competition, despite their disadvantages. And then the article lists all of the commonly recognized advantages of tubulars that I have already listed.

I can see the use of clinchers on a flat time trial course. There is evidence that clinchers have somewhat lower rolling resistance, and if the couse is flat and closed, then the safety considerations go away.

I have some big hills where I live. I once had a blowout on a front clincher on a short hill. It took all my decades of riding experience to get the bike under control while the tire squirmed away on the exposed rim. There is no way I am riding clinchers on warp speed descents, nor would I think they would be allowed in the pro peloton due to these concerns.