Seriously, this should have a focus on plastics that are NOT easily or even today, recyclable. Things like HPDE is fine. Why? Recyclable. And then we have ABS which is not recyclable, but is ideal for such long-lived things as sewage lines.
This really comes down to use and how recyclable something is.
Even now, I am disgusted that in Seattle, they are saying to NOT recycle aluminum foil that has grease/food on it. Well, that can only mean that the approach for recycling is a horribly cheap one, which likely means that it is going offshore, likely to China. Instead, we should require that ALL trash, recyclables remain within our nation and that we must deal with it correctly.