I think the cost will be a concern, but as all vehicles have hit the stratosphere recently, this may not be as big an issue as I thought before.
The interior concerns I have read in reviews will be a larger worry; my GX has no space up front though aftermarket solutions exist and I've adding them this weekend, for example.
BMW reliability and service options will be huge, and at this point, it's a major failure for nothing to be geolocated. Searching through Bosch itself sends you to a perpetual circle of non-answers, where no service stations can be searched for in the US. A year out...and no one can say where you'd take this rig in to get factory service?
And yes, I have read that BMW will do the service for the drivetrain.
This article said "200 locations by the end of 2022:
Ineos is setting up dealer networks around the world ahead of the start of Grenadier sales later this summer in the UK. Here's when we'll see the 4x4 here.
www.autoweek.com