This article was the first time I understood that particular way of implementing nomadic identity, and it's the first time I've felt genuinely excited by the idea.
My concern is that with "instanceless" nomadic identity on the fediverse is that ultimately, it would mean that instance would lose their sense of differentiation and community, and would simply be infrastructure instead, and that's how we we end up with bluesky.
This implementation though is amazing. It lets people actively lean in to community based instances, without having to only pick one, and it gives people protection against loss of any particular instance.