Plastic is fine for recycling as long as the process is simple and cheap. Pressing plastic into panels using a sheet press, for use in construction, signage, or art/crafting, is actually fairly efficient versus trying to recreate “virgin” plastic through melting and mixing. It can also be done on a smaller scale. See https://www.onearmy.earth/news/sheetpress

But I agree that typical plastic recycling is inefficient.