> Also the sizing of the text in the chart and how it is displayed in your page is tightly coupled and requires some forethought.

I used to make a lot of charts with R/ggplot and the big disadvantage is, as you mentioned, the sizing of elements, especially text. So I wrote a small function that would output the chart in different sizes and a tiny bit of JS to switch between them at different breakpoints. It worked pretty well I think, the text was legible on all devices, though I still had to check that it looks fine and elements aren't suddenly overlapping or anything.

Another advantage of SVGs is that they can have some interactivity. You can add tooltips, hovers, animation and more. I used ggiraph for that: https://ardata.fr/ggiraph-book/intro.html