Yeah, strange decision. Maybe they want to protect the Android One/Project Fi Moto X4, sold in the States but not in other markets.
I see this G6+ as an oversized version of the X4, with the big plus that this time they decided to increase the storage to 64, one of the biggest problems on the X4.
I'll probably be buying the Mexican version. Is only missing the 600 and 700 bands for T-Mobile. If any thing happens I just can cross the border and request a warranty claim.
Purchased the Latin American XT1926-7 version and using it on AT&T for a week now, so far so good been on LTE ever since without any issues. Enjoying the phone so far, camera is great IMO. Solid device I'd say.
I think they dont want it to compete with the Z and X range. Anyway if it was available it would be prone to timely security and OS updates b/c theres no way they'd release as a android one device. Im waiting on the Nokia 7+ to come stateside