TL;DR screens are short circuiting everybody's brains.
I think it's increased in the last few decades because our attention spans have been shortened from staring at screens all the time. And people who make movies and videos know how to keep our attention by catering to short attention spans, frequently cutting to new scenes, hence triggering our short attention spans and making us crave short snippets rather than in depth long subject content which require long attention spans.
Thankfully I was born in the 1970s and I was raised on books and I thoroughly loved books until the early 2000s when the internet finally took over my psyche.
The thing with books is it requires a long attention span and it's so much better for your brain as it requires thinking and visualization and analysis and you can pause and look up from the book and think about what you're reading and then go back and continue where you left off and you can learn new words and analyze the words and look up the words. These mentally-nourishing things do not happen when we are staring at screens.