thanks for the explanation! though i have to say i only have a vague idea of "fine-grained reactivity", any pointers for reading about this or systems that work this way?

in particular, i don't quite get this bit:

> By comparison the mechanism they ape (fine grained reactivity) works exactly the opposite way. You just need to be aware the stuff outside doesn't update.

inside/outside of what?

PS. my yet undeveloped pet theory is that hooks are (somehow) something like half a monad/algebraic-effect-thingy... though they're probably too tied up with the render cycle to analyze them this way