Why does Vue not allow deep-watching of HTML elements?

[erimcg]

The Vue documentation (Template refs # Accessing the refs) shows that you can use the ref attribute on an input element.

The watchEffect callback is triggered when the input element is loaded in the DOM, however it is not triggered when the user enters text in the input; even if you pass {deep: true} to watchEffect.

Is there a reason Vue does not deep watch an HTML element?

[edison1105]

Because HTML elements may contain many attributes, proxy them will cause page congestion.