It must be how the cars are being driven, we don't usually drive them above 3,000rpm. I know you didn't want to hear this sf, but our 2014 Crosstrek has 19,000 miles and I change the oil every 6 months or 5,000 miles (we don't drive a ton) and we don't have oil consumption issues. My Legacy is 10 months old with 6,800 miles and no oil issues either. I have a consistent coolant smell and both cars are coolant alcoholics, but that's another thread... So I'm wondering, are the cars that are consuming oil at a fast rate being driven hard?
I will note - An acquaintance of ours has a 2014 Forester with the 6spd stick and has about 15,000 miles. She's on her 3rd (yes THIRD) engine due to oil consumption. So it leads me to believe that the cars that are consuming oil at rate of an alcoholic hobo, are being wrung out.