> Agree that JSX is great (but styles like in Svelte also).
Oh yeah, 100%. One of the reasons I like Svelte are colocated CSS modules.
> seems like frameworks are somewhat converging now on this app router concept.
That for sure, and signals in one way or another. It took us 10+ years, Solid.js then preact to bring back a pattern from 2010s (IIRC) implemented in Knockout.js.
People are talking about declarative signals in HTML. I don't have a formed opinion about them yet.