You know, I bet every speaker manufacturer wants to hide when it comes to talking about distortion at anywhere near quoted output
Other than Welter Systems, that does seem to be the case ;^).
I have shared distortion specs along with frequency response whether they look pretty or not.
It is funny (ha,ha..) to see specifications extrapolated from AES power ratings (an open air speaker with impedance much higher than it's nominal value would suggest) with no accommodation for in cabinet thermal compression, or the fact that a fraction of the rated power may result in exceeding Xmax by such a margin that harmonic distortion components are much higher than the fundamental level.
That said, distortion is so much a part of most pop music it seems most folks simply don't notice it, especially when it's generated from subs.