@stereo5- I’ve owned cars that dated back to WWI. Some of the great cars were made pre-WWII. The analogy fails. There are pieces of equipment that are well worth restoring- old WE, Saul/Sid era Marantz, etc.
(there are many post war cars that are great, but whether they are worth restoring for market sake, e.g. BMW 3.0CS, Mercedes 300 6.3, etc. is a different question).
If your point is that the only safe bet is McI, I’ll disagree, though I’ve had McI stuff since the late ’60s- early ’70s and still use it. It is one of many that came out of WWII as mil-spec.