Fair enough just an odd conclusion to take. If a headphone has -10dB tuning in bass region, that could be a reason not to buy that headphone outright. If a simple EQ to that frequency reduces this issue then why is that dishonest to mention? Some headphones you simply cannot EQ as it distorts.

Similar to if you have 2 headphones, with one being much harder to drive you wouldn't review both from the same low power source, you would appreciate the different requirements of each headphone and review accordingly.