Your argument is based on the implicit assumption that a certain worse-measuring speaker can have nonlinearities and distortions that somehow magically compensate nearly perfectly for the acoustic problems in a certain room. That's simply not the case. A worse-measuring speaker might
partially mask or
reduce how noticeable a room's issues are. For example, a speaker that has attenuated treble and a major crossover dip between the midrange driver and tweeter might sound more "mellow" and less "zingy" in an excessively live room filled with highly reflective surfaces. But that doesn't mean this hypothetical crappy speaker is "the right speaker for your room." It means you need to do some basic treatment in your room, after which the better-measuring speaker will likely sound
better than the crappy speaker did in your untreated room.
Not to mention, even if for the sake of discussion we were to agree with your strange scenario of "synergy" whereby an inferior-measuring, more nonlinear or distorted speaker could sound more subjectively pleasant in an untreated room with sonic issues, you'd still have to be out of your mind to use such a speaker, in such a room, for mixing purposes, which is the whole point of this thread.
I can tell you what's wrong with your logic, pretty simply: nonlinearities and distortions are cumulative. Problems with the monitoring transducers lead to mistakes or bad choices or undetected problems in the final mix and mastering. So if you produce, mix, and master music using AirPods and iPhone speakers, it's going to sound worse than it would have if you'd mixed and mastered it on proper studio monitors and professional headphones - and it's going to sound worse than it otherwise would have on
all devices, including iPhone speakers and AirPods.
Not to mention, what rational mixing engineer would ever mix on an iPhone speaker or AirPod 2's when they know that within 1-2 years at most, there will be new iPhones and AirPod 3's that have higher sonic fidelity than the ones they've mixed on? So you future-proof by mixing on the best pro gear you can afford or get access to, regardless of what your consumers are listening with.
Finally,
@nqikz , if I might make an observation, with respect: you link to that 10 year-old Gearspace thread, and when
@Curvature asks what you expect them to say about it, you reply that it's "interesting" but you also agree that "they don't know what they're talking about." Earlier in this thread, you took a converse position, expressing resistance to the idea that measurements are of significant usefulness in choosing good mixing speakers. And a few days prior you started the "Why do some people say Genelecs are hard to mix on" thread. It's great to try to figure this stuff out - but it seems like you're having trouble deciding who or what to believe, and in the process you're sort of ping-ponging back and forth between "these random people said this and that in a thread," and "yeah, they don't know what they're talking about," and then, "no, measurements are not where it's at, because NS10s must work well or else people wouldn't use them." It's very difficult to have a conversation with someone who appears to be unable to get a handle on the concerns or worries that are driving their indecision about what choice to make.