The quote is not a contradiction at all, it can both change the world and be low quality.

If that's true for every AI output is up for discussion, but it's reasonable that if someone is skeptical about the technology, they will also be skeptical about the quality.

That the tech is taking over many areas is not a stretch at all, that's just something that can be observed. Big companies (not just big tech) have been trying to get away with lowering (cost cutting) the quality of their products for a long time, AI lends itself to the same purpose, and will (and already is) obviously be used for it. Starts with customer communication as you mentioned, and customer service, and believe it or not I don't think every company should generate their own tech stack and software for their little products.