[dginev]

Let's revisit your comment in a couple of years, when people actually have had the incentive to publish enough <math> elements out there.

If no one uses it, it will eventually get phased out.

I have just about a billion <math> elements in the arXiv preview site I develop: https://ar5iv.labs.arxiv.org/

And that is just one site. PubMed will likely have more than that at some point: https://pubmed.ncbi.nlm.nih.gov/