I'll take a crack at it:

• It's a massive privacy/surveillance concern. Look at the issues that come with doorbell cams and now multiply the number of cameras and scatter them all over
• It's another platform for mega corporations to track and sell data to advertisers or any malicious actors, but at an entirely new intrusive level. They no longer have to approximate what's getting your attention when they literally know what has your attention. Good luck anonymizing or hiding your usage when you can't spoof the real world in front of you.
• It's unnecessary e-waste, at best providing the exact same functionality you'd get from your phone with the added benefit of... not reaching into your pocket? You still need a free hand to use it...
• It's a distraction in a way that other tech can't touch. Pedestrians/drivers getting notifications shoved directly into their eyes won't end well.
• It probably has all the same inherent problems as previous generations of smart glasses. Primarily: your eyes aren't designed for extended/repeated focus on an image less than an inch from your face and at the edge of your vision