I personally mix / master with my trusted Neumann KH420s and I receive lot of mixes for mastering that are bedroom productions, of which almost 90% are done purely on headphones. Therefore I'm really interested in headphones world because when I know what works better for studio work, I can recommend serious headphones for my clients to become more effective / precise in what they do. But the truth nowadays is - budgets are getting tighter and tighter, talented producers unfortunately cannot afford solid monitors with proper room treatment, Covid is mostly preventing them to attend live sessions in real studios, so they are naturaly forced to mix with what is available on the market, in their bedrooms - often with headphones. Then of course, there are headphones and headphones. When I compare the quality of headphones made 10 years ago versus what's available now, it's a big step up in quality and sound reproduction overall, and no, I don't believe that headphones are not suitable for mixing - the world has shifted already in this sense and maybe some old school guys still can't admit it. However one thing I can say for sure - mixes I receive which were done on bass heavy headphones (be it Harman's bass boosted curve or something else), they just sound thin. Something in the low end is just missing there... Therefore I am more and more wondering what would Harman come up with if they performed this study / research amongst audio professionals.