Because convincing all the website owners to do anything (even if it clearly benefits everyone) is an impossible task.
See HTTPS adoption.
See HTTPS adoption.
https://storage.googleapis.com/cdn.thenewstack.io/media/2018...
Great example. You just proved my point that it is possible to have positive change in large communities.
That graph shows that there's an obnoxiously large number of websites that don't support something that there's zero reason not to support.
It costs $0 and takes maybe half an hour to implement, browsers are screaming "not secure" to each visitor, and one in five websites still don't support it. "Make websites faster", on top of being vague, is way more difficult to implement.
If fast site performance ensures you get listed first, every site would get faster overnight.