Completely unnecessary and just doubles the data structures and fights against the browser itself.

None of the fastest modern frameworks use it as far as I know (solid, lit, fast, svelte and stencil)

Is every user running a 2022 browser?

The worst offender I guess is Safari which has historically tied updates to a few times a year rather than much shorter cycles used in Edge, Firefox and Chrome.

Whatever delays there may be in those update cycles I’m confident that you shouldn’t need to be catering to 2012 browsers. VDOM just isn’t necessary as a performance hack and hasn’t been for many years at this point.