When I bought my Iphone 8 last christmas, Apple tried to sell me an Iphone x. When I asked why I should pay the extra for the x they told me about the facial recognition, I told them I was a blind person, there was a long silence and they said "so the eight will be good for you" .
I had my iphone 5 for slightly over five years,from September 2012 to Christmas of 17, and I don't know if would've been so quick to upgrade in terms of features if my battery hadn't died, I expect to be using my 8 for just as long, though if basically all the new phones offer is more things I cannot make use of like the camera and more random superlatives about the "better" quality of the hardware, I might be hanging on to my Iphone 8 for quite some time more.
As to large screens, a time might come when a screen is large and clear enough for me to watch films on, at which pint that would be a major plus for me, but none of the phones are large enough for that purpose yet, so as it stands I'm better going with something portable.
With our dreaming and singing, Ceaseless and sorrowless we! The glory about us clinging Of the glorious futures we see,
Our souls with high music ringing; O men! It must ever be
That we dwell in our dreaming and singing, A little apart from ye. (Arthur O'Shaughnessy 1873.)