We can quibble about the proportion of users, as well as how well it does all these things till the heat death of the universe.

The point is that if Emacs ships with an image viewer, it makes sense for that to be the default. If KDE comes with an image viewer, you would expect it to be the default - even if it sucks. Ditto anything on a Mac/iPhone.

> Emacs is bad at lots of things and that's okay.

It's also OK to have it as the default. Emacs usage is not shrinking, and they're OK sticking to their philosophy as long as it doesn't impede future development (it doesn't, as the last 20 years have shown).