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by SilverRed 1765 days ago
>in Cocoa and GTK?

This is reason enough. Already you now have to build the UI twice because there is no GUI framework that actually looks good on all OSs. You see this all the time where apps made on linux but technically work on macos just work terrible or look super ugly on macos.

You also have to remember windows, ios and android. When you build something targeting web browsers you only have to worry about screen sizes rather than OSs.