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It's pretty much a well known fact. Recycling is extra hard due to the need to separate the plastics and then the molding new plastics requires specific type of plastic molecule. Many plastics are even blends, e.g. ABS + PC, or glass fiber filled ones.

"Plastics" are just so many types, different in all kinds of ways. So separating them and using them in anything sensible doesn't happen often at all.