Eh, I like to think that I know a little.
I read. A lot. Read everything Subaru I can possibly take in, in a day. And it helps that Subaru posts the specifications on Subaru Global.
I also frequent Subaru forums looking up random information.
And I contact Subaru of America for information as well.
Speaking of which, no XV Crosstrek, but a third generation Subaru Forester (SH) demonstrating the VDC and AWD system working together, along with many other vehicles failing the roller test. Do note this roller test is very difficult, as the rollers they use are not low-profile rollers.
Noteworthy portions in the video:
40:39, 41:07, 42:08, 42:50, 43:04, 43:18, 43:47, all examples where the VDC helps the Subaru AWD by redirecting torque to wheels with the best traction. For most AWD systems, it's not entirely the AWD system alone, but the stability (commonly known as ESC) and traction control (commonly known as TCS) have to work with the AWD system to make an AWD system (especially with open differentials) very effective.
AWD sistems wars (testing) on rollers
The reason why most of the vehicles were unable to move is because most vehicles, even AWD vehicles, are equipped with open differentials (with the exception of the center differential on AWD vehicles). A small amount have a rear LSD, and very few have an LSD on the front and rear (which the Subaru WRX STI has, LSD on both front and rear).
Turbocharged Subaru models usually, if not always, have a rear LSD.
It's best to contact Subaru of America to check if your vehicle has a rear LSD. Sadly, I still don't know if the XV has a rear LSD (and would GREATLY appreciate it if someone would find out, sometimes I feel Subaru of America gets very tired of contacting me!)
For anyone who wishes to get on serious off-road trails, but doesn't want to rely on the VDC alone, one can upgrade the front and rear differentials to a limited-slip differential. Locking differentials (also called lockers) often found on conventional off-road vehicles are highly impractical for Subarus because kits do not exist for Subarus as far as I know, necessitating a completely custom drivetrain build.