I think the majority of people have the same experience with screens. There's something inherently distracting about reading anything long on a screen. Idly drifting to easy dopamine-hit activities is perfectly normal. Also pro tip, send anything long to your Kindle to read.

I'm not saying ADHD isn't real, just that environment-induced distractions aren't it.

There is some talk to classify "environment-induced" attention deficits as ADHD too, because the symptoms are the same.

The idea being, social media and the like became so bad in the last 10 years, that there is no functional difference between inherited ADHD and acquired ADHD. The only difference is that the acquired one might be curable.

This has nothing to do with screens. With books or e-readers, you just end up in your own head instead of social media. It's common for me to have to re-read the first dozen or so pages of a book several times before I finally get hooked on enough not to drift away.

However, at that point it becomes hard to do anything else before finishing that book...