In fact, I tested that, and it is very great work. For me, it is visually not as appealing as Gnome with forge.. And I understand that it makes sense to abandon the extension way and go for own DE with such a gigantic change of behavior of Gnome. Extension are just not made for that drastic changes which material shell is/was doing in gnome.
I’ll check what happens with forge and maybe fork it, if it really gets unmaintained.