If I edit a png file using gimp (open file and make some changes) and then save, I expect that gimp finally make changes to that png file. Whether it stores ses

If I edit a png file using gimp (open file and make some changes) and then save, I expect that gimp finally make changes to that png file. Whether it stores session or layers or whatever in xcf should be transparent to me. I don't need to separately export it again to png. Because... I opened a png, I made changes, saved it and closed the file. If gimp not doing it, then it's an issue. Maybe, don't let people to open other formats. But let them "import" other formats. This will maintain consistency . Whether usability improves is another question.