I keep the yellow urea plastic adaptor in my draw now. It doesn’t seem to have much of an aura without the rest of the colourful adaptors. No new developments have occurred in either Churi International or Izutsu Seisakusho Ltd. Someday, all products will be made using reusable plastic. Green Sustainable Chemistry has a long way to go.
So far, I’ve found that DAISO (YAZAWA) plug adaptors have absolutely no problems regarding usage. If chosen carefully, it should be safe, (doesn’t heat up) and won’t fall apart easily.