alt Hacker NewsWell, i've always been a fan of the island architecture that effectively mounts root nodes as little islands of isolated state, yes.
Mainly this avoids the hell that global state SPA patterns produce: redux, reducer patterns in general, and 8 thousand context providers.
I do think there's use cases that warrant global in-memory state, but it's such a pain in the ass to maintain and evolve, i'd always plan against it. Every html node in your app does not need to know about literally everything going on and react instantly to it. it just doesn't.
Just make another page!
Also: so the islands pattern can be as fancy or rudimentary as desired. they can bootstrap themselves via async endpoints, they can be shipped as web components even, or they can be static, pre-hydrated in some manner.
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The islands pattern is underrated for maintainability. I've found the biggest win isn't even the state isolation — it's that each island can have a completely independent upgrade path. You can rewrite one island from React to vanilla JS (or whatever comes next) without touching anything else.
The global state SPA pattern fails for a more fundamental reason than just being painful to maintain: it creates an implicit contract between every component in the app. Change one reducer and you're debugging side effects three layers away. Islands make the contract explicit — each one owns its data, full stop.
The one gotcha I've hit is cross-island communication. PostMessage works but gets messy. Custom events on a shared DOM ancestor end up being the cleanest pattern for the rare cases where islands genuinely need to coordinate.
Do you need react at this point? Isn’t it just html/css/components?
I remember the birth of React was because Facebook had a problem - you would add a comment and your notification bar would sometimes not get updated.
They had so many bugs with normal html / css that they wanted to solve this on the application layer - to make inconsistent UI elements unrepresentable.
So they came up with react with global state - because in their use case changing one thing does affect a bunch of other unrelated things, and they all need to sync together.
I mean honestly that’s what I use React _for_ - especially with contexts it’s very easy to express all of this complex interconnected state of a webapp in a consistent way.
And of course there are other ways to solve it - for example with elixir/phoenix you just push all that complexity to the backend and trust in websockets and the BEAM.
I just feel that if you really don’t need global state, then react kinda isn’t needed as well…