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FOV is determined by the distance of the screens from your eyes, which are user-specific. Lots of users have reported [0] that switching to a 21W [1] light seal, or removing the light seal altogether [2] provides a massive FOV increase.

[0] - https://www.reddit.com/r/VisionPro/comments/1aiuwm4/change_f...

[1] - https://www.reddit.com/r/VisionPro/comments/1ai9eqc/light_se...

[2] - https://www.reddit.com/r/VisionPro/comments/1aiq3si/wtf_remo...

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I'm pretty surprised that a product that's spent this long in development and is being released with such a high price tag would still need to be modified by users for what is arguable the most critical spec. And also I have no idea was 21W and 33W refer to so it seems unlikely the average user will have any idea.

Footnote 2 explains what each number means.

Why wasn't this incorporated by Apple in the original product?

I have no idea. I’d imagine using a light shield increases the relative brightness of the displays, which could be important to Apple.

Some users cannot use the thinnest lightshield: their eyes or eyelashes touch the lens.

Apple did make them interchangeable and exchangeable (for free), so it seems like the major FOV issue is with their scanning and auto-selection (for some users).

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