I see! Thanks, that's a very clear explanation 🙏 
Then I've been bookmarking the wrong way and it's going to get real confusing to what "Bookmarking" even means. 

For notes/insights/literature I've always preferred using tags/labels as a categorisation system because of the overlap in many different topics. I thought nostr lists fixed that because I could add the same event to as many lists as I wanted (and not just one). Didn't know about the size cap. 

One question: you can have a lot more than 2k followers and that's a list too, no limit there?