In the middle of the night a couple of days after posting this poll — and before I revisited the thread — I suddenly realized — as several of you pointed out — that “smaller screen” was a misnomer.
I definitely should have made that choice “smaller device” or “smaller form factor”!
Alas, I see no option for editing the choices such as adding a parenthetical “Smaller screen (or smaller device)”. Only thing that can be done is to add a new choice! Which would mess up interpreting the results for that choice.
In any event, appreciate the replies. Please keep those cards and letters coming in, folks! There's good info in these responses to help owners think about different reasons to upgrade — and to spur me to considering an upgrade of my iPhone SE 2016!
So far, better screen, better camera, and worn down battery lead the pack!