Correct.

It does not require a "service" to consume multiple blogs efficiently, just simply "software" (an app will do).

The below RSS readers pretty much do their job and get out of the user's way. What's amazing is the sheer number of RSS readers that people choose to use; there are so many, people find ones that they personally like.

On desktop: Vienna https://www.vienna-rss.com/

On iOS: R2SReader https://apps.apple.com/us/app/r2sreader/id1608635613

Of course, if one wanted to use a service (or run one oneself), for features like syncing, then that is possible too.

But the basic setup remarkably simple, easy, and useful by itself IMO.