Then I could just blink them and get benefits.
Instead I sometimes can't follow a book that is both engaging and interesting to read because 3 pages in my brain will throw at me at least one novel story plot bunny, musing on alternative solutions to whatever is the problem in the book, musing on implementing things from the book, possibly multiple software project ideas, etc.
And all of the above can happen for both fiction and non fiction.
And then come the interrupts while trying to focus, which quickly lead to situations where I can't focus due to expectation of interrupt, which only then leads to doom scrolling because it both fills a need to do something and is worthless enough to not care about being interrupted