FWIW Shimano were looking to restrict the availability of XTR to teams and pro/elite riders a few years back, as the level of warranty and internet complaints was far too high. Basically tubby weekend warriors hanging XTR off their 6" trail bike and expecting it to last as long or longer than XT. As it was twice the price.
Doesn't work like that.
I reckon marketing got to work on that idea so we've now got XTR-Race and XTR-Trail. So you can get essentially an XT groupset with an XTR finish and XTR prices. And a few upgrades. (no where near enough to justify the cost difference in most cases)
No, i can't really see the point of XTR-Trail either. Other than showing everyone you can afford XTR.