Ah - you're right. I was sloppy calling it offroad when really its gravel roads - bad roads.
I still think its a strange way to save weight and money but I'm not an OE buyers for car companies so what do i know.
I'm going to actually go there and physically make sure the spare fits in the tray space.
You might be one of those odd minority of people who actually use a Sube on gravel roads and this might be a topic for another thread: Does VDC or Subaru's traction control make a substantial difference for people driving on gravel roads?
Context - I used to drive logging roads a lot in rear wheel drive trucks and am quite used to long oversteering slides. Then drove mid 80 Subarus then a 1999 Legacy wagon and lately I've had a Volvo V70XC for the last while with their DSTC (traction control) but am drawn in subaru again for many reasons to lengthy to list.