You're lumping in the regular 8 there, but that has the same resolution (PPI) as the XR and 11, it's only the plus models (equivalent to the Max variants of the past two years) that are higher resolution.Those screens have higher resolution. The 8/8+ series is actually probably the most underrated iPhone model. They ended up selling very well over the two or three years, are built great, run fast, have great screens and cameras. Wireless charging, etc.
I don't think people underrate the 8 at all, I think most people recognise it for what it is, a solid but unexciting iphone that played second fiddle to the X from the day it was released.
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Presumably they produce their figures using the same tests they ran on the XR, in which case you've nothing to worry about at all.Funny how they always test the battery life for video streaming an listening to music. Might give good results. Try using it for web browsing, business apps and mail and you end up with figure half or one-third of what they advertise. Crossing my fingers 11 Pro would last through one normal work day without charging. If not, back it goes.