Tags are useful for filtering out things. So if a post is tagged with “meme”, I don’t need to see it, even when I’m on a view that’s wider than just my subscriptions. Meme is a good example for me, because at this point I’ve had to block several meme focused communities because it’s content I really don’t care to see. I don’t want to suggest that people who enjoy it shouldn’t be able to, but I also am tired of blocking new communities as I run into them.
I often like to browse the “All” view instead of just my subscribed communities. It helps me find new communities, as well as get information from communities I wouldn’t normally be interested in. Unfortunately, the most popular communities are mostly meme communities. That content does well to grab users, get upvotes, and have comments. As a result, almost any way you sort “All” comes back with Memes at the top unless you block the communities.