That’s not how the Harman Target was derived. It corresponds strongly with what we hear from targets that aim to reproduce flat-measuring speakers in a semi-reflective room, targets which were derived from a procedure no less rigorous than what was used to determine the DF target, and then preference from a study group of ~280 people was sprinkled on top.
That study group consisted of everyone from casual listeners to audio professionals.
The target isn’t entirely derived from preference. Harman pitted the most popular targets against each other (including DF), used the most successful as a starting base (which was NOT DF) and further tuned it based on a broad base of listener preferences by taking the error curve deviations into account.
Even if they didn’t tune it further based on preference, their research found that most people did not prefer the Diffuse Field target.
If you enjoy that target you, my friend, are an outlier. Your judgement doesn’t align with what most people will actually consider “the best sound,” and that’s fine. Just don’t swing your very unique preference around like a great big Johnson in everyone’s faces.
For more detail, you can find the research in summary
HERE.