Well, VGC has it at 1.4m but it wasn't updated since early 2018. My bad.
And looking at VGC data it sold 1.4m in one month. So, 1.5m for XC DE should definitely be possible
No problem! And uh... VGC data is also wrong again lol
XC 2 did 1.06 in one month, as reported by Nintendo itself.
My (locked) thread about how difficulty should be a decision for the developers, not the gamers.