I can definitely appreciate that. I just think it's important that people argue the right thing. It provides insight to the variables and mechanisms at play, and avoids people falsely giving rhetorical checkmates to each other, like I kind of did to you.
The brief version is that if someone has a screen real estate concern, they need to look for the PPI, but if they have a visual quality concern, they need to look for the PPD.
Maybe it will be elucidating if I describe a scenario where you will have low PPI but high PPD at the same time.
Consider a 48" 4K TV (where 4K is really just UHD, so 3840x2160). Such a display will have 91.79 PPI of pixel density, which is below even standard PPI (that being 96 PPI, as mentioned).
Despite this, the visual quality will be generally excellent: at the fairly typical and widely recommended 40° degree horizontal field of view, you're looking at 3840 / 40 = 96 PPD, well in excess of the original Retina standard (60 PPD), which is really just the 20/20 visual acuity measure. Hope this is insightful.
The brief version is that if someone has a screen real estate concern, they need to look for the PPI, but if they have a visual quality concern, they need to look for the PPD.
Maybe it will be elucidating if I describe a scenario where you will have low PPI but high PPD at the same time.
Consider a 48" 4K TV (where 4K is really just UHD, so 3840x2160). Such a display will have 91.79 PPI of pixel density, which is below even standard PPI (that being 96 PPI, as mentioned).
Despite this, the visual quality will be generally excellent: at the fairly typical and widely recommended 40° degree horizontal field of view, you're looking at 3840 / 40 = 96 PPD, well in excess of the original Retina standard (60 PPD), which is really just the 20/20 visual acuity measure. Hope this is insightful.