Why on earth are all US panels painted the same dark grey? That's something I never understood! And the doors basically look the same since the age of porcelaine fuses... All European countries have light grey or mostly white panels, sometimes even with elaborately designed plastic doors.
Besides, most DIN rail panels are a lot smaller. A 2 row panel, which would take up to 36 single pole breakers is (just a rough guess) 10x14 inches, maybe even smaller!