All of that will be solved by miniturisation and advancement of tech.
I think you are short sighted (haha!) to think that headsets and glasses are different categories, and that headsets are not just a preliminary research phase to things in the future like smart contact lenses etc.
Let's not hand-wave field of view. Glasses cannot display anything outside the bounds of their frames, and therefore cannot have a field of view as large as a headset. No amount of miniaturization will overcome that limitation.
Contact lenses having the capability of a headset? That's just magical thinking.
I think you are short sighted (haha!) to think that headsets and glasses are different categories, and that headsets are not just a preliminary research phase to things in the future like smart contact lenses etc.