I don't own a Suburu but my…
I don't own a Suburu but my Bronco Sport has this feature and I hate it. Not only is it going to wear out the starter, it's dangerous. The hesitation, in some instances, could cause an accident. It's like when the ABS brakes first came out in the 80's. That hesitation did cause accidents.
And, not only accidents, if your battery goes bad and you get a jump to start it so you can drive to the shop, you might just be stuck at a traffic light when it shuts off.