It's not different than a woofer driver is it? Tweeters can be easily bottomed out with bass before the coil gives out. A spider is not used but the dome itself provides the restorative force. Fingering the Scan I have next to me it seems that the dome is quite resilient to pushing. :P
Surely xmax is not as important in a tweeter but it is still important. Not sure I agree this is a numbers game. That's the sort of thing planet sound domain guys or npdang v2 would say if you catch my drift.
I'm inclined to say that the tweeter performs rather badly despite having what appears as good stroke behavior. Maybe the diaphragm, chamber or coils have a compromised design, and the tests would indicate that's what needs more work.
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