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Reddit removed r/all "Entry points and links to r/all being removed starting today"
(support.reddithelp.com)
This is a most excellent place for technology news and articles.
I'm on old reddit and I didn't know there was a difference between /r/all and /r/popular? Theres the subs you are subscribed to and then there is the trash main page. What is a home feed? Is that the front page with your subscriptions?
Popular is supposed to be the highest activity subreddits. If you keep scrolling you'll only see older posts from the same set of subreddits. r/all is all the subreddits sorted by popularity, if you keep scrolling you see lower and lower upvote counts.
Your home feed is your subscribed subreddits.