That's a detached, rational, coherent way of looking at things that has very little to do with how actual people "use" the blue checkmark, and how Twitter grooms its users to use it.

The more complicated reality of how the checkmark works is that Twitter wants to have things both ways: the checkmarks promote accounts, and Twitter benefits from the increased engagement resulting from promoted accounts, and promoted accounts benefit from the exclusivity of the checkmark. But promoting accounts also puts Twitter on the hook, perceptually, for what some of those accounts say, so Twitter also has a fig leaf notion of the checkmark as simply a "verification system". But it's obviously not that.