Sure it does, it is good because it's functional. I could similarly write a convoluted yet highly short Perl expression, less code is not always better.

I tried Solid. Signals are not new, I've used Knockout before and it turns into a spaghetti mess after a few years. I guess people today simply aren't old enough or experienced enough to know what eventually happens with fine grained reactivity.

That page doesn't really answer why it can solve the issues of Knockout better. Eventually the same problems will arise, of spaghetti code among things reacting to other things reacting to yet more things.