The big hurdle for widely available AR/VR is microdisplay availability. They require displays that are massively denser than regular glass-based LCDs and OLEDs but the ones made like silicon chips. Further, they require specialized drivers for generating correct voltages and waveforms, and they have to be coupled to exotic optics, either the "pancake" concentric reflexive lenses or stacks of Fresnel lenses for VR, or with off-axis optical surfaces or even sliced stacks of PVD coated surfaces or worse yet literal nanoscale or holographic metasurfaces for AR/smart glasses. Those can't be turned on a lathe, barely potentially 3D printable with transparent resin.

That makes smart glasses as a business to only make sense as a massive project with tons of stakeholders involving technical consultants and actual manufacturing companies that can still make those things. That can't be for cheap knockoffs, and that's the problem that needs to be solved for cheap smartglasses.