The only issue with playing 'perfect' tracks like Giorgio is that most gear sounds amazing with them. Especially high-end gear. It's going to be harder to design a high-end IEM that doesn't sound amazing with Giorgio or Hotel California or Keith Don't Go. I mean, if any of those sound even remotely deficient or harsh or soft in any part of the frequency range with those tracks, just toss the IEM in the bin and move on.
Edit: just to add, whenever I'm reviewing or testing a new IEM or headphone that's meant to be really good and hit on a track and think 'eh, what happened there?' I almost always go back to one of these platinum reference tracks and 'ah, there it is.'