You'll still need a second device for when the glasses need to be charged, which means you're carrying around a second device (which will likely be doing most of the processing), and it will need to have a screen - making the glasses redundant for most tasks.
If they're going to be 'light weight' they'll have terrible battery life. The limitations of physics still exist with lens/diopter thickness and weight to make the screen look like it is far away, as do the physical limitations of processing power vs. battery life.
There's also the problem with focal distance. If the eyes are converging and focusing on a real-world object in the distance, they cannot simultaneously focus on a virtual object less than an inch from the face. One of those things is going to be in focus and the other is going to be blurred. This is why VisionPro (and all other VR headsets) has a light seal around the face and video pass-through, rather than transparent screens with a real-world pass through which is an available technology today.
VR/AR headsets with any meaningful functionality are always going to be bulky and heavy (because physics), and they're always going to have very limited battery life, meaning you'll always have to carry another handheld device with you as a back up. You'll also need to carry an input device. People want privacy and don't want to be talking out loud to a headset, and the pinching/typing on an invisible floating keyboard solution doesn't allow for any real productivity. Which, again, means you're carrying around a second device or a keyboard - in which case, just put the screen on that device.
Not everything needs to be a wearable device. Glasses aren't going to be a 'put it in your pocket when you don't want to wear it' kind of device like a phone. They will always be a less convenient, more expensive, limited use-case, unnecessary device - the very things that define 'gimmick'.
