Just like a segment of enthusiasts are currently under the hallucinatory spell of ASR numbers, so another segment has bought into Harman target = FR panacea. In particular, Metal was a serious Tyll Herstens devotee and Tyll was infatuated with the Harman thing before he retired.
May as well respond to your question in the Currawong thread:
Lol. Even that would be better imo than the wild west free-for-all currently happening. And I vote we re-name the Harman Over-ear Headphone Frequency Response Target to the Harman Whatchamacallit.