The treble peaks, you mean the sibilance? Maybe my ears have gotten used to it. I no longer am very sensitive to that anymore and I used to be.
I rather not use any EQ as my intention is owning different headphones to enjoy different sounds. I pick depending on my mood. I need to block noise? I got my T5p.2 and Amiron Wireless. Sound is no problem? I got my Amiron Home. Resting my head while watching series on my bed at nights? I got my Airpods non-Pro. I assume the 3rd gen earpads works for gen2 too? The inside pads too but they're a bit pricey. Beyer is now providing service parts for T5 and T1 3rd.
Then my ears have gotten used to it better than I expected. I needed to be very careful. Or maybe I'm just stubborn?

If I didn't buy my T5p.2 back in December 2019, I may have gotten the 3rd. Getting both is a bit senseless to me personally.