As someone who actually knows this stuff, effectively sorting my trash is way too much effort for effectively very little return as I also know chances are even if I do it right my stuff will be burned anyway.

It is completely unrealistic to expect the average trashbin user (as in literally everyone even if you can't read) to follow recycling instructions for plastic (paper tends to be simpler). It's much too complicated and a majority of the packaging you'll find in supermarkets involves way too much effort separating the materials.