My general experience with RSS users is that they understand not every post is for them. I've got some feeds that I read once or twice a year when I'm in the mood to learn what's going on in that corner of the world. I've got feeds where I skip 90% of the posts, because they're not the topic(s) I subscribed for. And I've got feeds I read daily, of course.

I tend to expect most useful sources of high-quality information to have a fair amount of off-topic content, since it's hard to reach critical mass on a single narrow niche. I read Hacker News, but click maybe 10% of the links