Yes I see! I was thinking some kind of invisible added toughened layer that might come with new cameras nowadays.
I've inquired before about using a clear "filter" as a lens protector and the general consensus has been don't because lenses have a protective coating, however a hood is a good idea.
I just wonder how tough these screens are nowadays and whether touchscreen makes a difference. Google the subject and there a rash of people selling protectors but no comment or promises from manufacturers. And I wonder why Nikon no longer supply a clip on one ... because they're not needed?