The switch is smaller than my current graphics card. The switch + ALL of its accessories is (rough estimate) slightly less material than what is inside my PC case. Certainly far less electronics. Most of the Switch accessories are just plastic.
edit: If the one metric you want to maximize (or minimize) is electronic waste, the ONLY device you should own is a high-end smartphone that you carefully maintain so that you can replace it only after at least triple its expected (2 year) lifetime.