> The people who subscribe to that belief have no idea beyond "plastic = bad"

So... you're saying that there's not an accumulation of plastic waste / microplastics in the environment, or that we know any impacts or benign or negligible?

Good news if true, would like to know what position there's the most credible evidence for.

> and "landfills = bad".

I'm a fan of consumer goods, so naturally it's convenient for me if landfills == good, but I also tend to wonder (a) exactly how effectively they isolate waste issues from, say, groundwater or other environmental circulation and (b) if there might be some volume threshold past which landfills aren't an adequate solution for addressing waste streams.