We live in an era where people will spend days of their lives – hours at a time – to watch a box set or series of movies. We spend hours listening to podcasts. We still read novels.
Long isn’t a problem; “too” is.
So if “too” means “It would have been better for the people it was made for if it was shorter,” then the problem belongs to the author.
But often “too” means “This isn’t too important to me,” or “I’m in too much of a hurry,” or “I don’t have the stamina to engage with something long and nuanced,” then the problem is ours.
“tl;dr” might make us feel better for a moment, but it does nothing for either problem.