I don't think that's the case at all though. I have two full playthroughs under my belt, both between 80 and 100 hours.
Once I noticed the problem, I started counting in my first playthrough - over the course of the majority of the game (>50 hours of gameplay), I had less than 10 instances of banter firing. I had almost none in my second game, but I started using cheat engine to trigger it shortly after gaining Skyhold.
Thing is though, some people are claiming that they don't know what the problem is, they're swimming in banter. Maybe you're one of the lucky ones. There's definitely something fundamentally wrong with the way they're firing, though. They should have stayed with the environmental triggers (I assume that's what they used in DAO and DA2), and just peppered them liberally around the zones. That way you could say "Oh, hey, there's a bridge. I'm gonna get a banter."
I had a problem with not having any banter triggering for hours, and sorry but hours of silent playthrough without banter or music is really boring! Unfortunately as I have to play on PS4 there is no cheat option and it seems the problem is still not fixed which given how long DAI has been out and how many people have reported the problem is really not good enough, but pretty much the sort of poor service I am learning to expect from Bioware.
Yes TW3 has problems to and no one is saying they don't (before a certain troll for Bioware pipes up with a load of garbage again), the difference is CDPR are working hard to fix things, where as Bioware seem more interested in producing over priced dlc rather than fixing their broken game. CDPR listen to people reporting problems and respond to them, Bioware are pretty much silent in regard to problems and they seem to refuse to fix problems even resorting to dropping support altogether for part of the fanbase. I also notice they are still selling the game for PS3 and Xbox360 despite it being totally broken on those systems and despite them no longer supporting them with dlc, when the decent thing to do would be to withdraw those copies from sale like Rocksteady did with Arkham Knight on pc, but nope Bioware/EA are all about ripping off the fans!