I've been using it for several months now and at first I found it cumbersome but now its quite nice. Working on a very large OSS project, I end up with quite a few notifications. I need to be able to work through them and decide if I want to act now, later, some day, or never. The new system works perfectly for that. The article's complaints seem to be mainly about the UI/UX of the project, which IMO is not nearly as important as the Concepts (in the Jacksonian sense [1]) it empowers. UI/UXs are relatively easy and can incrementally improve over time. Concepts are difficult and heavy.

Do I have complaints regarding the UI/UX? Of course. But it's beta software, it would be insane for me not to.

[1] https://mitpress.mit.edu/books/software-abstractions