Sample size of 1 and whatnot, but this has absolutely never been my experience on my iphone 7, which I've kept up to date and stopped using less than a year ago. Scrolling in Mail, for example, was the contents following my finger. Hell, I complain about Android phones, even newer ones, which lag while scrolling the settings app, but even there I've never noticed that big of a distance between the finger and the text.

Never handled an SE, though, but I doubt it's worse.