Every one has reasons for their concerns, and complexity is something to be concerned of... but it seems most critics are arguing from a view which implies they don't support the "declarative component" model itself.

These added features are simply extending that paradigm in a natural way that supports better UX, within the constraints of the javascript language.

Nobody says they are easy problems to solve, but it's sort of a non-sequitur to argue alternatives that don't solve them (or don't absolve one of having to solve them still.)