Four years is an eternity in software, especially now that we can have LLMs write the first draft.
Transformers were only invented six years ago after all. Some people are even very optimistically projecting that we'll reach the singularity in the next three.
Making comfortable and capable mixed reality glasses common is not primarily a software problem. In fact, I'd say the challenges are almost entirely unrelated to software, though there probably would be a need for a richer software ecosystem designed for mixed reality for them to really take off.
