I'm not sure I understand, there are still plenty of sites with RSS Feeds, native or via 3rd parties (OpenRSS, RSSHub, nitter, proxigram).
And for those websites without them, scrapping to RSS is (IMHO) the easiest solution. See pipes.digital.
Anything with similar functionality would need to reinvent the wheel and implement the same features that RSS has.
But maybe I'm missing something...
Credit: u/JG_Online and u/UltraWorlds. This is the comment on the original post from reddit: