Should a high end system be flexible, or demanding?

This is a discussion we dance around here a lot. I want a system that is flexible. That lets me play music from Sister Rosetta Tharpe in the 1940s all the way up to today and enjoy it.  I simply can't expect mono recordings from then to sound the same on my system as they did to the recording engineers at the time, nor can I make a 1940's "reference system" work well for modern tracks.

Making a system that is too demanding that keeps you looking for audiophile approved recordings while ignoring music as culture for the past 100 years is a kink.