True. In my case, I'm using Github's built-in Jekyll implementation, and I prefer to keep it as bog-standard as possible, so I went with in-browser rendering. I expect that one day many years hence, something will break and my diagrams will stop working.

One day, I should sit down and manually render them all to .png and update the markdown to use the .pngs instead. But today is not that day. Tomorrow isn't looking too good, either.