In 3D printing, "print" generally refers to "most of the device, except those components that one versed in the field would recognized as being composed of materials not suitable for printing".
Though I do agree with you, many people who do 3D printing would not find the title misleading.
Where did you hear this? I probably see people use "glass" to refer to lenses as often as I see "lens."
https://www.google.com/search?q=photography+lens
You'll see not a single glass lens by itself, but rather every image will be of an assembly containing optical lens intended for mounting to a camera.
Also, enter any photography store and ask to see the lenses. You'll not be presented with discrete glass, but rather with assemblies containing glass intended for mounting to a camera.
Perhaps in the eyeglass industry the term "lens" refers to the glass itself as a discrete component, but not in photography.