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So, why should GNOME support server side decorations?
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Because they're objectively better on a desktop.
Your compositor should control the window - if the poorly implemented client hangs, you can just click the server-side close button a couple times and get the "shall I force close this?" popup
The only reason for CSD is touch interfaces on small screens. In that case, you still need some other interface to handle misbehaving applications, but they tend to be harder to use, e.g. the removal of home/back buttons on Android
Edit: If you're trying to improve on SSD, you could consider some model where the client can register some actions it would like to have displayed to the compositor, and the compositor can relay clicks back to the client. In this scheme, the compositor still owns the title bar, but the client can request special decorations