I use Reeder and I’m sure it can discover feeds from main site URL.
But this works:
% curl -sL https://meta.discourse.org | grep "rss+xml"
<link rel="alternate" type="application/rss+xml" title="Latest posts" href="https://meta.discourse.org/posts.rss" />
<link rel="alternate" type="application/rss+xml" title="Latest topics" href="https://meta.discourse.org/latest.rss" />
So how can be our (fully up-to-date) site different from Discourse Meta?