If I open a PNG in Photoshop, crop it or resize it, it stays in PNG when I save it. This is such a common workflow that it makes me wonder if you use Photoshop.

If I open a PNG in Photoshop, crop it or resize it, it stays in PNG when I save it. This is such a common workflow that it makes me wonder if you use Photoshop. I understand your points, but it doesn't mean that there aren't pragmatic UX choices to be made here.