I think it's a very good article. Even if you disagree with some of the individual points in it, the advice given are very concrete, pragmatic, and IMO tunable to the specifics of each project.

On state, in my current project, it is not statefulness that causes trouble, but when you need to synchronize two stateful systems. Every time there's bidirectional information flow, it's gonna be a headache. The solution is of course to maintain a single source of truth, but with UI application this is sometimes quite tricky.