Yeah, it’s the use case. Qualcomm had smartphones in the 80s, General Magic had the smartphone in the 90s, but it took more than another decade to actually combine phone and browser into the right form factor and fast enough mobile connection and a world wide web to make it work.
For AR there were moments too. Niantic with global positioning, 5G with fast mobile internet, but that was not enough.
Input method isn’t clear yet (Apple may have solved it with gaze-pinch), form factor not consumer market ready. Actual use case that is worth the price point? Nah