If your job is to write UI frameworks, by all means do that
Otherwise, yes, you do need React (or something like it). Don't waste time re-solving the problems these frameworks were created to address. Spend your time creating value for your users. Building bespoke state management systems is not needed.
Otherwise, yes, you do need React (or something like it). Don't waste time re-solving the problems these frameworks were created to address. Spend your time creating value for your users. Building bespoke state management systems is not needed.