This may sound like cope, but there's something liberating about having like 3 followers on nostr.
I don't expect people to really see my notes and replies, so I just use it to vent or write down my thinking on things. It acts as a complement to the handwritten journal that I keep.
The external benefit is that when many others do this we have an excellent pure way of seeing what others think, which helps us all calibrate.
The big tech platforms lose this because they amplify the most divisise views, and may even ban you for writing down your thoughts (even if you didn't care that they be widely seen). Also, they own your notes/posts and you don't have any guarantees that they will always be accessible to you.