There are TONS now; Especially newer static generated sites where the owners don't bother setting up RSS

To be fair it's the new(old) fad of Static Site Generators that are at fault. They don't generate a feed file, or if they do the owners haven't bothered to (or don't know how to) surface it.

Google (and other search engines) have a standard for sitemaps: /sitemap.xml in the root of the site. It'd be nice if there was a similar standard for rss, i.e. /feed.xml - which means browsers and other clients can attempt to auto-discover it.

I know there's the 'link rel="alternate" type="application/rss+xml"' meta-tag but again most users don't know to look for it now that browsers don't have the little icon on the toolbar, and a lot of self-coders/site-generators don't bother to implement it.

At the end of the day, RSS has fallen out of favour due to it's poor support for user-tracking and advert injection - the big sites don't use it for exactly that reason, and the rest of the internet sheep are following suit. It's another nail in the Internet open-standards coffin :(