I've used React for ~3 years, primarily with function components and hooks. I think that hooks were a wonderful addition and I think the framework has made smart choices with checking object equality to decided if components re-render.

That said, I think that easily the most difficult aspects of react revolve around how re-renders are triggered. Maintaining referential equality to stop unnecessary renders gets tricky when you are passing functions or objects. Suddenly you need to be using `useMemo` and `useCallback` and passing dependency lists that all have to be primitive values unless you want to memoize them as well. It can become such a headache that the official line around it mostly seems to be "make the render fast, don't worry about unnecessary re-renders" – good advice, until you hit a use-case where you need to worry.

Solid takes these problems and just vanishes them. UI state knows what its dependencies are automatically and only updates when they change – even in a sub-component level!

To be fair, I've never used Solid in anger, and moving to it would be a big ask when there is such a good ecosystem built up around react. That said it is easily one of the most exciting projects on my radar, and the developer Ryan Carniato seems extremely knowledgeable in the area.