Nice, now only the other dozens non gtk apps (e.g. electron, or java based) need to get those as well. Oh and native Adwaita look and feel would be cool :)
Why are rounded corners desirable? Is there something obvious that I miss?
I would think that rounded corners opposed to harsh angular corners are preferable as they feel more smooth. In the case of Gnome and LibAdwaita, the top left and top right corners are rounded off, so why not the lower half as well (also all other widgets are rounded off as well)?