I agree with you. nip-51 has good intentions, but it suffers from pre-mature optimization. You've got lists and their definitions. Then you have sets, which looks pretty much like lists as well. A lot of things going on here.

My interpretation is that kind 30000 is the closest thing to "here's a list of npubs, give it a name and do with it as you please"

I've tried using listr.lol, and it also makes a noble attempt at handling *all* of these types which can be overwhelming.

Twitter did it well. Super simple, create a list and add people to it and that’s it.

In terms of keeping them updated. Don’t underestimate the power of a few people maintaining lists of specific people and topics. I maintained my own lists simply because it made my everyday browsing experience easier. Bitcoiners, Philosophy, local news/sports, Musicians etc….