Favoring modern design on the icons is good. It doesn’t state that it has to be flat, it just says that it should at least follow some modern design guidelines so that the app doesn’t send the impression of being an older, unmaintained thing.
If I find an app in Flathub that has an icon that looks like it was made 20 years ago I’m shocked when it ends up using modern frameworks. I think Inkscape and GIMP are the only examples that comes to mind.
Favoring modern design on the icons is good. It doesn’t state that it has to be flat, it just says that it should at least follow some modern design guidelines so that the app doesn’t send the impression of being an older, unmaintained thing.
If I find an app in Flathub that has an icon that looks like it was made 20 years ago I’m shocked when it ends up using modern frameworks. I think Inkscape and GIMP are the only examples that comes to mind.