Rule idea: Should SVG text without an SVG background fail?

Noticed this when we were researching if SVG text should be treated as an "image of text" (SC 1.4.5). If you use windows high contrast mode you can change the colors of the page, but you can't change the colors of SVG that way. If you have an SVG text on an HTML background, the HTML background color will be modified in high contrast mode, but the SVG text color will not, thus creating something akin to the issue you get when you specify the text color without setting the background color.