I have it, doesn't mean I'm always on it or look at the feed. Lots of trash but there is gems hiding in the dumpster. Algos also pick up on the stuff you tend to visit the most and fills your feed with that. Nowa days you just have to say "vacation" near your device and your news feed will be filled with hotel ads to your fav destination. It's like being stalked and that's a bit creepy to sell personal information without knowledge. Like you said tho, some tend to just overshare or behave boldly for attention, all the wrong reasons to be on social media.

We all do what works for us I know plenty that are happy ignoring it altogether like you are. You are probably not missing out on anything substantial.