I am seeing a rather clear (if incomplete) parallelism with 3D television (which, oddly, I never see mentioned, even by detractors). What was it, 10 years ago? All TV producers pushed it hard (it was impossible to buy a high end TV without it). AAA movie producers pushed it hard (a lot of blockbuster movies were _designed_ to be 3D first).

Just like with VR, the technology wasn't new: I had watched a 3D movie some 30 years ago at a theme park, liked it, threw up and passed out afterwards, for the first and only time in my life - doing it after a rollercoaster was not a great idea. Just like with VR, it required you to put something on your eyes that people found awkward - and ultimately, this was possibly what made them unpopular, if you want to relax, you don't want to focus on your hardware.

A bit like VR, the early glasses were cheap and disposable (just pieces of red/blue plastic); the "pro" versions with active filtering were significantly more expensive and technological. But for all that, they didn't solve the main issue, i.e. they weren't less intrusive, if nothing else more so (heavier, requiring batteries, etc.). In this case, I'm not sure if the Apple vision is a step forward or backward - if I understand correctly it makes the experience "better" than other visors, but it is also bulkier.

A lot of optimism on this technology comes from saying "it is not yet mature, give it time, the first iPhone was very limited, etc.". But the main issues I see seem just too hard to surpass in a few technological iterations:
- The experience is limited to the eyes. No matter how magic Apple is, I'm not ready to believe that in 5 years wearing something as simple as a goggle will give me tactile feelings or anything else. Though I'll admit, 3D vision might be enough.
- Battery power won't evolve tenfolds. The first iPhone didn't have a shorter battery life than the current ones, and that's because research for better batteries and more efficient CPUs is already cutting-edge - a 2x improvement would be huge already. Everybody just assumes it will get better, but not everything does, or at least not always fast enough.
- The main issue everybody notices is lack of apps and, in general, something to do with it. Here, people cite the iPhone as an example of thing that developed a lot of apps, which made all the difference between the first and later versions. This might happen thanks to the Apple Vision Pro, but I'm not ready to believe it without proof. Just a few years ago, Apple pushed hard, very hard, the touch bar on basically all of its users. Certainly more than half the developers (not just mac developers; all developers) had it integrated in their working machine, whether they wanted it or not. Yet, I only saw apps starting integrating functionalities there years later, and it was often half-baked things, and even when they were not I found myself never using them - the old hotkeys, or the F-keys, were easier to memorize, and faster. And Apple did roll back on that, now I have again physical buttons which I very happily use to change screen light or volume.

All in all, maybe this technology will fly, maybe it won't, but if we look at the past we shouldn't forget the large fraction of technologies that didn't make it, or which at most thrived as a niche sector unlikely to ever explode. Not everything that Apple makes needs to be the new iPhone - and why should that be a problem, really?