“friend of iFixit Karl Guttag has a blog post explaining why using the Vision Pro as a replacement for a good monitor is “ridiculous.”

…

This, says Karl, makes for a virtual Mac display with low enough PPD to see individual pixels—not quite the standard desktop display”

So rather than just trying it for themselves and realizing Karl is wrong, they quote this uncritically?

For what it’s worth, there’s nothing wrong with Karl’s math. He’s just not taking into account the fact that the Vision Pro isn’t mounted in a fixed position and that your brain integrates information over time.

In practice it certainly is as clear as my 4K display when I use it for mirroring.

It’s definitely not as good as a 5K studio display, but then Apple never makes that claim.