I don't know if it's attention spans or w/e but it does feel like fewer people of all generations are reading now, and when they do read, they just want slop. Anything that demands engagement or effort from the reader is denounced as 'badly written'. It drives me a bit mad tbh, because at the same time that people smugly reject good literature, you can see that they're unfulfilled reading the same old dreck for the millionth time.
A common thing I used to see on Book Twitter was people complaining at the lack of beautifully written prose that focuses on the interior life and I just want to scream THAT'S MODERNISM YOU'RE DESCRIBING MODERNISM, READ THE WAVES, PLEASE READ THE WAVES, IT WILL MOVE YOU SO DEEPLY, but the thing is that while they want that, they also only read YA dystopian fiction written in the past simple as an iron rule.