One of the problems of your suggestion conerning pink noise is that a speaker can test great on a bench and sound terrible to the ear.
Again it depends on what type of speaker one perfers. That is where the debate centers east coast vs west coast.
I could site several examples of that happening. I am aware of those who
Years ago when there was more audio publications there was magazines that hated the JBL sound and others that loved it..
I bought my daughter a pair of AR 4ax speakers when she went off to college. Later I found pair of JBL L100's used for an excellent price
$70.00 for both. As a book shelf speaker I prefered AR , not my daughter
she loved the JBL L100's. , still has them.
But than we listen to different music.
Audio equipment is so subjective , especially speakers.