2) I used my Powerbook G4 for 12 years; this is mostly because I was a kid with no money. When I got something else, my sister used it for another 3 years. With thermals as they are in this device, instead of selling it after 4-5 years I'd rather keep it for one-off projects as a server like a Mac Mini. I know laptops aren't designed for server work, but I love that it's a server with a builtin terminal. Also a device I'd use for hiking, because I could charge it from backpack solar.
3) The worst experience I've had was telling my dad MacOS Catalina couldn't be installed on his $3.5k iMac.
As you said in your other comment, M3 will be 3nm TSMC? Maybe Linux will look good on Apple Silicon then.