Yeah, wot is basically the same as any other content-related algorithm. Different algorithms will take different things into account, and different people will choose different algorithms, maybe by use case. That doesn't mean having data structures that are explicitly wot-focused are a bad thing, they can be a useful part of the solution. But I'm with you — if someone kind 7's all of someone's notes, that's a strong signal, and doesn't require the user to maintain anything to get the benefits.