Equalizer in a Hi Fi system

Pretty much every track we ever listen to gets run through something like this dude before we ever hear it.  So why would a little EQ in the home listening room upset any purists?

I don't get it.

Understood.  Any crappy component in the signal path can possibly do more harm than good. 

But then again, compared to the distortion in frequency response from speakers and room modes, seems like at least room correction done properly would be big improvement.  I have heard a lot of folks mention they do room correction and I cannot remember any of them less than seriously happy with the improvement.

I don't know for sure but I expect that most of those mix boards nowadays used in music production are op amp based electronics. And no track is getting to our systems without going through those...