Your confusing description of sounding good and accurate. There's no such thing as "sounding good", that's completely a subjective analysis that's effected by too many variables, including room acoustics. However, accurate speakers
should sound better for the typical listener than a speaker with exaggerated frequency response, when put through a series of different source material. (The more accurate speaker will be more versatile as some material will sound bad on the inaccurate speaker due to a loading up effect of the exaggerated frequencies).
Also, I know you found a wiki article about studio monitors being "tonally accurate," but it's completely impractical in a mixing booth and a lot of engineers found this out the hard way. Soft domes and rolled off treble is a design decision for nearfield listening because most of the smaller studios have no space for a proper speaker setup. Now it
may be a possible that these mixing monitors in fact are more linear in crammed environments due to the number of reflections from the proximity of the listener, and that the measurement system is flawed (where you put speakers in an empty room and a mic 1 meter away) because it isn't accurate of the circumstances of the environment where it will be used.
The higher end studios actually mix with more traditional speakers in traditional loudspeaker placement. You can use more accurate speakers because you aren't sitting inches from them.
Here's Digital Domain Studio which is fairly upscale and has recording 1000s of major records. They've got a larger studio and can mix with linear speakers without the fear of listening fatigue.