No need to be toxic about it. Do you think anyone who disagrees with you is automatically an asshole?
Other than that, there’s plenty that’s changed other than the existence of short-form content, with everything going on in the world right now people are more stressed than ever. And stress is definitely one thing that reduces attention spans.
Not saying that that is the solution but it’s definitely one explanation and in my view it’s more likely than what’s basically just the equivalent of ‘phone bad’.
I think the inner monologue is more there to “support” the processing of information rather than being filtered through it entirely.