I think you still don't get what I say, let's don't go into the loop.
1) adaption is needed for any new system, or anyone into the industry, due to human nature and also due to one need to produce something sounding nice on most systems, not the ____ control room environment.
2) for exactly the same reason you listed here, a good mix can be done with literally any thing not distort like hell or don't have HF/LF roll off way too much, just like in the same NS-10, some home studio did use them as sole tool of mixing and producing say, acceptable mix, but this don't make them a better tool, if the adaption to well know reference is the single holy grail, just to say building a complete, good, ATC or Genelec or "insert your favourite brand" room will be pointless, coz one can mix on far less gear with the adpation of the reference material.
Let me illustrate my point once again and not derail:
1) Reference materials are important to do the human calibration, but a better tool, the less our brain need to fill in and that, lessen the problem of fatigue or chances for error.
2) In the real world, be it the engineer or the consumer, the better the speaker in neutrality, consistency, distortion, extension, group delay etc. will be preferred.
the origin of all these debate or derail: arguement of ATC being not SOTA at some aspects, the same question to everyone:
If ATC keep their drivers, distortion, transient, group delay, just add that tweeter waveguide (and maybe larger waveguide for the legendary mid dome), and make the off axis smoother, will you prefer that to the current offerings, no Genelec hard dome tweeter breakup/alledged port noise, no D&D woofer distortion, just ATC improved in the directivity.