Heat cycling is a huge stressor on any material. That’s part of why diesel freight trucks tend to last well past a million miles while it’s newsworthy if a passenger car makes it that long. How many times a week is your Toyota Corolla driving 10+ hours at a time? Most commonly, when you hear of a million mile vehicle, it was making long haul deliveries daily and was maintained at the correct intervals.
My wife’s 2019 16" MPB is running pretty great. Probably got another 5 years of life left in it. She uses it to watch YouTube and play Sims 4.
My 2016 Acer Aspire V3-372T is hanging in there running Debian. 60 FPS YouTube videos are getting to be too much for it anymore. I may have to put the old girl to rest one of these days.
But hey, it does play Minetest pretty flawlessly.