Chi-fi is incredibly insulting. Who do you think builds your iPhones?It's a big deal because there are several issues at hand, but you are focusing on the issue which is not what makes people angry at Hifiman for.
Firstly, the R10 reached legendary status because 20 years ago it was unique, and while true that it would probably be classified as a pair of headphones that has a peculiar sound tuning, nevertheless it was something which Sony spend a lot of time and effort to design and make.
However, the Sony R10's technical merits as a headphone on its own as measured against modern headphone is actually irrelevant to the discussion and people's issue with Hifiman's move currently at hand.
This is because Hifiman blatantly comes out with a direct ripoff of the housing - which serves as an essential acoustic tuning property of a closed-back headphone and requires many man hours of trial and error to do especially back 20 years ago when prototyping and machinery is a lot less developed than today (no 3D scanner or 3D printing for starters, computing power is also a lot less so computer acoustic simulation would also be extremely difficult) - and shameless admits that they check the patent design and knows that Sony can't sue them (which is essentially acknowledging they ripoff the unique acoustic property of the inside design wholesale), with Hifiman itself being a well known audio/headphone brand, it says a lot about the company doing this because they did not spend the time and effort to make an essential component of the headphone while capitalising both its engineering as well as brand value.
IMO Hifiman had set back the state of Chi-fi 10 years with this move, just when Chi-fi has began to show they are no longer making cheap knockoffs and can go with completely original designs, Hifiman came out to re-solidify that stereotypical imagine of Chinese companies just being ripoffs of other people's hard work.
Why is anyone here languishing about a HP that has been dead for 20 years of which Sony does not give a damn about.
Hifi man has done a great thing by bringing back a touch of nostalgia. Great job hifi man!