Most of the code needs to be re-written because of GTK advancements? Without knowing the codebase myself, I'd expect GTK advancements would be an expected thin

Most of the code needs to be re-written because of GTK advancements? Without knowing the codebase myself, I'd expect GTK advancements would be an expected thing and keeping up with them would be more routine maintenance work that a complete re-write. Technical debt that piled up?