Solid is basically using the same Flux architecture that Redux and Vuex is using then, with stores and actions. It's just more hidden away than in Redux which is more explicit. Yes, I do want to explicitly see what my data store looks like and in Redux I'm able to. That I have to create slices (which are automatically mapped to TypeScript by the way) is fine with me, it's only a few lines more than in your Solid example.

To add, this is also why I explicitly mentioned Rx and Mob, which are not as clean as the Flux architecture in terms of creating spaghetti code. And I believe we are also defining spaghetti differently. Spaghetti != boilerplate.