The following guidelines are not required for submission to Flathub, but are best practices we recommend and consider for curation and promotion. These guidelines are designed to help your app and Flathub itself appear in the best light to users—they may change over time based on developer and user feedback.
I do think that as a store it should have some guidelines on quality, but not of the application icon’s styling
That dark theme screenshot is bad and light theme is good is nuts because if theme is important you provide a 50/50 screenshot showing off the themes.
I don’t think that was the point, it says “Having some screenshots to show off that e.g. dark style is supported is fine.”
If you look at the screenshot, it shows the app using a weird font, as well as non-default header bar buttons. That’s the main area of contention. Screenshots showing weird fonts, non-standard window additions, custom themes, aren’t recommended.
Showing the app supports dark mode is completely fine.
I don’t think that was the point, it says “Having some screenshots to show off that e.g. dark style is supported is fine.”
If you look at the screenshot, it shows the app using a weird font, as well as non-default header bar buttons. That’s the main area of contention. Screenshots showing weird fonts, non-standard window additions, custom themes, aren’t recommended.
Showing the app supports dark mode is completely fine.