You don't have to "truly" correct for the room for EQ/calibration to be worthwhile - you just have to make it sound better than it did. I've used the built-in calibration in my WIIM Pro and it subjectively made a massive improvement.
I used to be in-principle anti-EQ, but the AutoEQ project for headphones completely changed my opinion (though obviously headphones are far easier to EQ).
I used to be in-principle anti-EQ, but the AutoEQ project for headphones completely changed my opinion (though obviously headphones are far easier to EQ).