Lots of songs have "flat" recording that even the best headphones or audio speakers won't change that much the experience. I'm thinking about songs from the early 70s and before. If you listen to some Ariana Grande of course you'll hear the difference from one equipment to another right away, but I have a few songs in my library that are actually very flat and not the best example to judge the equipment quality.
So, I agree him. I wouldn't limit to 1 song but when I try new equipment there are a couple I play first.
I was only wondering why it would make sense to do that. I hope I didn’t come off as bashing. Whatever works for you is what matters. But I guess it may be the same as like texting a certain game on a new device to see if it’ll run it. And if it will, you know you’re safe with other games.