While watching them, I was reminded of the "PDF Reflow" tool. I had forgotten about that A novel I'm currently reading is in PDF format, and I always have to tediously zoom it as best I can to get the text to a comfortable size, without needing to scroll and pan. Remarkable how well "PDF Reflow" works for emulating the zoomability of EPUBs (at least for plain novels).

I guess I'm even helping myself these days!