it's useless as a solution to the actual problem because usually the filename and an image preview are the only pieces of information you get about an image no matter where you are and saying "well just display the quality level" is incredibly ignorant of the literal entire world not doing this

uploaded a file to discord? preview and filename

found an image on google? preview and filename

opening a file on your computer? i fail to understand how windows explorer is not relevant when you can't just set the image viewer for save/open dialogs on windows, that's just not a thing that's possible to do

and even then, do i want to know the quality level of an image only after saving it manually? also no

tl;dr when you see a .jxl file you have no idea how compressed it is, but when you see .png you know that it's always lossless. it's not hard to understand how png will stay relevant for at least this reason