HTML is good for semantically describing a webpage, which is good for accessibility. Tags like "section" impart semantic meaning. It doesn't seem to be a first-class feature of SVG:
1) I’m not saying we replace HTML altogether. So if you’re talking about writing an article, sure use HTML (and things like section tags).
2) You can make SVG and HTML equally accessible now with WAI-ARIA roles (https://developer.mozilla.org/en-US/docs/Web/Accessibility/A...).