aiming to be modular, flexible and without too strong an opinion on user experience

Solid supports templating in 3 forms JSX, Tagged Template Literals, and Solid's HyperScript variant.

This is just a library not a Framework.

The $ contract for auto-sub­scrib­ing is lovely in its sim­plic­ity and flex­i­bil­ity. You can adapt your own preferred state-man­age­ment pattern or library, with or without Svelte stores as helpers. Svelte does not fuss about how you want to manage your state.

Instead, rather than trying to implement what it thinks is the best way to bundle different type of assets, it leaves that entirely up to the developer to decide.

Svelte currently has no opinion as to what you store in an exported class prop of a component. It will not necessarily be used a class attribute.

Now, do I care which one you use? No. As long as you test your code, I am happy. A professional developer should be able to work in either one of these because they essentially do the same thing: test your code.

Unlike many flux frameworks, MobX is unopinionated about how user events should be handled.