I don't really know what you mean. There's a ton of feed readers, both from an application and server side. I don't really need a lot of organization, but I've never seen a reader without support for folders. If you need more than one layer of hierarchy at 50 blogs... I have no idea what you're doing. I follow like 250 blogs and have just two folders, maybe, and it's super maintainable.
Anyway, services like Feedbin have been going strong for a long time, have a rock solid syncing system with great tools for things like seeing frequency of posting and abandoned or moved feeds, folders, automatic filters, and broad support in the app ecosystem if you don't like their apps or web experience (which is very good).
RSS is absolutely extensive and has millions of users. It's at least as mainstream as Mastodon/ActivityPub, it's just not talked about as such, and that's _excluding_ Podcasts as a use case.
Anyway, services like Feedbin have been going strong for a long time, have a rock solid syncing system with great tools for things like seeing frequency of posting and abandoned or moved feeds, folders, automatic filters, and broad support in the app ecosystem if you don't like their apps or web experience (which is very good).
RSS is absolutely extensive and has millions of users. It's at least as mainstream as Mastodon/ActivityPub, it's just not talked about as such, and that's _excluding_ Podcasts as a use case.