You're conflating a feature of a genre with a medium or format. The phenomenon that you're referring to (retconning) is a feature of a genre, one which enables the creation of rich and intricate stories that couldn't emerge any other way.
Batman is a particularly bad example to choose for this, because it's actually been exempted from several of DC's hard resets (see: New 52). Although DC in general does this less well than Marvel anyway.
If you don't like them, that's fine, but they're not the only comics around, even if you're only buying stuff from the Big Two. Dismissing comics as "toothless drivel" because you don't like the narrative vocabulary of one genre is like dismissing cinema because you don't like Avengers movies.
And I'm saying that's not even an accurate description of DC or Marvel.
If you don't like them, that's fine, but they're not the only comics around, even if you're only buying stuff from the Big Two. Dismissing comics as "toothless drivel"
That was my point. Superhero comics have created a mainstream perception that all comics are like that, that the entire medium is too lazy and greedy to commit to a narrative.
The problem is compounded by the fact that Americans see animation and comics as something for children while the US entertainment industry pumps out unsophisticated drivel. There are countless anime series and movies that are more emotionally and intellectually complex than most live action entertainment produced in the US.