Declarative, state-driven UI development is a valuable abstraction. Which browsers do not support natively for decades and entire markets of ecosystems grow to

Declarative, state-driven UI development is a valuable abstraction. Which browsers do not support natively for decades and entire markets of ecosystems grow to work around that stupidest fact. Browsers could detect, batch and “reconcile” (whatever that means) the changes to the js runtime with much less runtime and devtime overhead than it is done in js by manual state tracking and updates.