Because AppImage doesn't solve the problems. - No sandboxing - Doesn't solve the "run everywhere" problem, AppImages usually are compiled agaisnt Ubuntu LTS's

Because AppImage doesn't solve the problems. - No sandboxing - Doesn't solve the "run everywhere" problem, AppImages usually are compiled agaisnt Ubuntu LTS's, which isn't 100% binary compatible with other distros, e.g. fedora - Its a game of bingo whether the AppImage has a library bundled or not, and whether the app will work your host version or not. - Performance, appimages are a compressed filesystem that getss mounted by fuse each time the app is run, which is slow, additionally subsequent launches of the app aren't even faster because we get fresh inodes each launch. - Bad system intergration, appimaged is an abomination. - AppImages promote a bad security practice of marking binaries from the web as executable, let's not replicate the main way malware is distributed on Windows.