I wasn’t thinking about applets but more about full-blown libcosmic applications.
Gnome Circle bas a lot of very simple apps that do just 1 thing and weight a couple MB each at worst.
With iced such an ecosystem would be at 20MB per app, so simple " don’t 1 thing and do it right" apps would be less scalable. And I doubt you would want to have all of gnome circle as a multicall binary.