So … what I’ve learned is, with the help of an extension one can indeed get an SVG to appear under WordPress … barely. (Take a look at the little Irish Airman experiment.)

It drops in as media, and WordPress can only link to it, not embed it. I.e., via an img, not by including the SVG in the HTML. This is okay for some purposes, maybe not so great for others, since among other things, it makes controlling the scaling relative to the HTML page next to impossible.

The larger theme is the “too much to know” problem. Because people don’t know how to use SVG, support for it is slow to come. Since support for it is slow to come, no one explores it and learns how to use it. Folks like me (nothing special, I just came in through a side door) are outliers again.