GTK needs to go away because it hampers interoperability. When I write an application and I want to use a GTK widget written by person A and a Qt widget written by person B, I'm fucked, I can't use them together. And users end up with inconsistent desktops because GTK to this day cannot use the KDE file picker dialog. Perhaps they'll fix that some day (I doubt it), but that's just the tip of the iceberg.
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