Mine is stainless steel and also has an air gap in the walls so it keeps it hot for a very long time.

I think there's a difference between maintaining something and replacing a part every now and then (resoling a boot for example) vs. replacing literally every part over time so that eventually there are zero parts of the computer that are from the original purchase. Just my 2 cents, but I don't think computers are BIFL. Technology advances too quickly and makes every part in the computer obsolete in 10-15 years.

Right. I understand the appeal of only replacing the parts that need to be replaced when they need to be replaced. I just don't really consider it BIFL when ultimately every part will be replaced.

Won't literally everything have to be upgraded eventually though? Maybe not the shell and screen, but everything else. Even the motherboard will have to be upgraded eventually.