You are the first person I've ever heard of that referred to the framework as thicker and clunkier. That's good for you that you buy used and have had your desktop PC running with the same processor for 4 years but also that's upgradable. You don't need to get a new case or power supply to upgrade components. It's not just about upgradability but reparability in case something breaks or you break something. Even supporting second hand market a macbook only has so much life. The hardware can go EoL and no longer get software updates but your screen and keyboard still work fine. Would be great to just upgrade your chipset instead of the whole laptop because the processor is so old that companies don't want to support it anymore.