it was a bit painful without search, but they finally merged the long-hanging merge request, and now the search across posts is available in the stable version!
totally recommend!
also, a bit aside, but for podcasts: antennapod seems to be doing a good job too!
https://hnrss.org/
https://rsshub.app/twitter/user/{username} for twitter accounts
Append .rss to any subreddit URL you want updates on
YouTube also has an RSS feed for channels