They're bigger than the old SE, but effectively a fair bit smaller than the X/XS/11 Pro format, which has a much larger screen to manage.
So, this phone gives those of us who liked the 8 body size an upgrade path.
David Smith compiled iPhone usage stats for his app. The iPhone 6/6S/7/8 had 47% share. The iPhone 5s/old SE had 11% share. The X/XS/11 Pro size had 12% share. So, this new SE is an extremely common and and popular design.
https://david-smith.org/blog/2019/06/24/the-popularity-of-th...