People talk about "e-waste" regarding non-upgradeable computers; do you think upgrading a computer generates no waste? What happens to the old part? Does it alw

People talk about "e-waste" regarding non-upgradeable computers; do you think upgrading a computer generates no waste? What happens to the old part? Does it always find a new home? Eventually there's always going to be a part that gets thrown away. With non-upgradeable/self-contained/all-in-one computers, when you buy a new one, the old one continues to be perfectly usable on its own, unlike a standalone RAM stick or SDD or video card or..