I'm not saying you're wrong. What I AM saying, is that regardless of any headphone, if it is generally liked, the vast majority of users will say it scales.
"It scales" has become a general term for me, the same as "This headphone is good", because you know people are going to say this, whether you agree it's good or not.
At this point, I just consider it as them liking the additional flavoring of their amp/dac with the particular headphone in question. And as you know, people will always, ALWAYS recommend what they own. There is a tendency to justify what you purchase. Human nature.
As for my gear, I don't personally recommend the X7 as it's a bit lean sounding and I only really recommend it for thick, slower sounding headphones.