I am kind of sympathetic to that view. In practise i do find most DoS vulns to be noise or at least fundamentally different from other security bugs because worst case you get attacked, have some downtime, and fix it. You dont have to worry about persistence or data leaks.

But at the same time i don't know. Pre-cloudflare bringing cheap ddos mitigation to the masses, i suspect most website operators would have preferred to be subject to an xss attack over a DoS. At least xss has a viable fix path (of course volumetric dos is a different beast than cve type dos vulns)