For people who think they'll be designing and coding on Vision Pro virtual screens all day might be disappointed.

I’m perfectly comfortable spending 8+ hours in a day writing code on a non-4K screen (widescreen with the pixel density of a 27in 1440p) and based on what I’ve used in the past could probably handle anything as good as a 27in 1080p monitor with the right fonts.

That said, I do find the screen door effect on my Valve Index rather distracting and can’t use it for longer than an hour or two without risking a headache, especially if I am reading any text (tried watching a movie with subtitles and oh boy).

So I don’t think retina resolution is necessary for work (at least for me personally) but it does seem like having the screens so close and completely covering vision does increase sensitivity to picture quality so I may be wrong about that.

What's the killer app for this device which other devices on the market don't support today?

I don’t know that a killer app for it exists, but with its built-in developer base it’s inheriting from iOS thanks to using the same APIs (a dev base that’s notoriously fast to pick up new features, at that), I believe the chances of a third party dev finding a killer app are significantly higher than with prior AR platforms.

Also worth noting this is not a “headset” but a computer (“headtop”?) in a different format. Think of it not as buying a headset for your gaming rig but as a laptop replacement.