Why high-end cable manufacturers don't post measurements?

They probably do but it would be so complicated  and confusing  .That you need to be an Techinal Engineer to understand it.

If you want to use high priced ,I mean totally over priced cables ,its your choice.Nice to have money to burn.When you worked for a dollar an hour $40 a week 50 years ago.It make you question everything....Think about it there are people  here who would never buy a $40 cable ever ,ever,never....