Aside from destroying UI style, #clientSideDecorations break an established reading pattern.

In a traditional dialogue box, you work your way down through options and the final command trigger is at the bottom.

In #GIMP on #wayland, the "Export" button jumped up into the titlebar, above the relevant options.

I'm sure if you built a UI around it, it's a learnable convention, but it feels very foreign in a 2026 context, like some lost artifact from Visi On or RISC OS or the Alto reanimated.