Multilayer packages - MLP's - that's why.
It's not a tough answer at the most basic of levels. We've taken multiple materials - each of which accomplishes something useful for the overall chip package - and have fused them together in ways that make them nearly impossible to separate again and recycle.
Now, how are we trying to recycle them in spite of all the steps we've taken to make sure the materials couldn't easily separate?
Step one is to find a way to separate the un-separateable through heat, pressure, and high pH.
From there it's mostly down to regular recycling, but that first step is a doozy.
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