If you look at https://blockprotocol.org/hub and can survive the <5fps (yikes!), you can see that they've demonstrated reimplementations of <p>, <img>, <h1> by piling mountains of Javascript/JSON on what is (hopefully?) just those standard HTML elements under the hood.
If I have to pick between standard slow-moving HTML and wild west HTML-reimplemented-in-React, I will choose the former every time. I will never have to worry about "my <p> has been abandoned by its maintainer and is now malware!".
If I have to pick between standard slow-moving HTML and wild west HTML-reimplemented-in-React, I will choose the former every time. I will never have to worry about "my <p> has been abandoned by its maintainer and is now malware!".