I've never created extensions for #Gnome, but as a webdeveloper I think the change is a right step. #JavaScript uses ESmodules, it's a standard since many years, so now maybe more JS programmers can start creating extensions for Gnome. I just hope it won't be too difficult to rewrite some of the old useful Gnome extensions.
#Linux

Extension developers can port and test their extensions now, so they are ready for GNOME 45.