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This article contains quite a few technical terms, which I will explain these in the following paragraphs, those that are already familiar with these terms may skip to the next section. A basic understanding of linux and it’s desktop environments is assumed.
Server side decorations (SSD) is the term for when when the application’s titlebar is drawn by the system and client side decorations (CSD) is the term for when the applications draws it’s own titlebar. KDE prefers the former, while GNOME prefers the latter. KDE and most other desktop environments supports both, while GNOME only supports CSD.

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Server side decorations (SSD) allow the desktop environment to draw application titlebars, while client side decorations (CSD) let apps draw their own. GNOME only supports CSD, causing issues: many apps handle CSD poorly, requiring workarounds like libdecor that provide neither integration nor customization; non-GNOME apps feel less native; users on other desktops want SSD respected on GNOME apps; and the lack of xdg-decoration protocol support increases Linux desktop fragmentation. While GNOME argues SSD is out of spec, the protocol is adopted by every other production compositor. The proposed solution: GNOME should implement SSD for apps that request it while keeping CSD for GNOME apps, and allow other desktops to optionally force SSD on GNOME apps.

So, why should GNOME support server side decorations?