I think you're right, but I'm not sure Apple can pull that off. Google tried and flopped - the software on the Glass was just completely incorrect - they just took apps straight from Android and tried to run it on the Glass instead of building new stuff from the ground up that was actually appropriate for the platform.
Siri and the HomePod is what makes me doubt Apple can pull it off. Siri turns 8 this year. She was a joke then, and she's still a joke now. Virtually no progress has been made on this front.
Indeed Google flopped.
There are specifics from concept to inception that need to be considered:
Navigation:
The idea that some navigation can or would be done by gestures is ideal (for efficiency). Take the computer gesture navigation that Leap, Inc created just 2-3yrs back. Implementing a similar yet much much more advanced device to detect "local"gestures that somehow will not detect normal walking and similar conversational loose hand movements will be required. Most importantly with gesture navigation, like languages, will need to be considered how some gestures or most likely MANY are NOT universal on a global scale. e.g. nodding one's head side to side (UK, Italy, Greece, N. American , and many many S. American countries) means "No" ... yet in India ... could mean " I don't understand what you're saying but I acknowledge what you're saying" may not work.
Clarity of UI:
What is the best colours or shades in low light or bright light, direct sunlight that will be legible on the lenses for those with 20/20 or less eyesight?
What's the best font for readability for various languages?
What's the best spacing for text (within words or between them on a small screen where it's magified)?
What's the best view for paralax when looking directly ahead, turning one's eyes slightly off center, or side to side, or turning one's head when wearing glasses??!
^This is my first year fully wearing glasses when driving or reading daily at work and I find the following:
turning my eyes from left to the right monitor or back again has an odd paralax feeling.
After wearing reading glasses for 8hr shift taking them off my eyes FEEL messed up (like pulled or pushed into my head).
Battery Life:
especially for the digital glasses will be crucial for any sales to occur from the public perception. Ain't nobody going to wear a reticle with a heavy helmet.