While I agree that since Gnome Web is likely the best base, it is essential to ensure that it works and looks good across other desktop environments. It is unfortunately one thing that libadwaita is not great at. Gnome Web does a solid job of this, but it is not true of all GTK/Gnome apps that use libadwaita, especially when used on QT based DEs like KDE, which like Gnome is a huge user base.