I would say 95%+ do just this. The Debian, Ubuntu, and even Fedora repos are very large and include all the software you could ever want. And then flathub takes the rest.

It’s really only arch with the AUR and some others where completely untrusted packages are used. This is legitimately a better model than what windows does, although Microsoft has been trying to change this with winget.

Virtually all desktop Linux users do. The biggest exception is AUR as its not vetted.

'desktop Linux' is a term used when the majority of Linux users don't support your argument.

Are you disputing that the repos are vetted or that users use them???