That's quite a statement. I'm sure many here will disagree with you on that. Can you name those headphones? Did you do a comparison with your own system and for how long?
We all have our own preferences. Being a lifelong musician, mine align with the sound of real instruments. STAX are the only headphones I've heard so far that have a certain transparency that, to me, sounds much closer to real life.
I have owned around 50 headphones. (See profile.) A few notable ones include the STAX SR-207 & SR-30, Sennheiser HD 650 & HD 700, and HIFIMAN HE400i. I've also spent hours listening to the Abyss AB-1266, HIFIMAN HE6 & HE1000, and Sennheiser HD 800 on very expensive equipment with my own test tracks in most genres. Again, STAX are the only ones that truly impressed me, even when I was using the STAX on my own setup at home with cheap amplification and my laptop's internal DAC!
@miceblue has had similar experiences comparing the SR-207 to the aforementioned headphones. It actually has a more neutral frequency response and lower distortion than any of the others, along with a rapid impulse response.
I still prefer other headphones for certain things, though, aside from acoustic transparency. For example, I might be in the mood for something with heavy bass impact, which 'stats do not excel in. And I'm certainly not saying that any of these headphones aren't worth buying for plenty of people. I just favor overall realism above all else.
...You missed my question about which anime you like. haha