Having worked in optics, having only 3 ipds and having to choose between them (unless you happen to be one of the 3 numbers) is pretty awful. In fact, pretty disgusting. No optician woth his salt would say this is a good thing. There should be a range so you can get your exact pd. If you`re out of the range, bad luck. But making people choose "thereabouts" is unacceptable and I see lawsuits in the future for Zuckerburg due to this. I`m sure he don`t care though.
Personally, I would advise not touching the Quest 2 unless your pd matches exactly one of the 3 numbers.