What is your argument here? That we already work with state machines implicitly in UI code so there's no point in making it explicit with a library? That Svelte

What is your argument here? That we already work with state machines implicitly in UI code so there's no point in making it explicit with a library? That Svelte's reactive mechanics are so good that it doesn't make sense to use an external library even if it is specialized for modelling things as a state machine? Because I agree with you that Svelte is great and reactive programming is powerful but if you had a problem that looked and acted like a state machine, why you wouldn't just use a state machine? And if someone had a library ready to go that managed it for you, so much the better.