You said > All too often I’ve seen people encoding 8MP photos as PNGs... And now apparently it's some CMS that was doing that... which doesn't make much sense

You said > All too often I’ve seen people encoding 8MP photos as PNGs... And now apparently it's some CMS that was doing that... which doesn't make much sense either. Either way this is just such a patently and obviously dumb thing to do that it makes me doubt your experience is anywhere close to being statistically significant.