In 1968, Subaru introduced the diminutive 360 as an inexpensive economy car: “Cheap and Ugly” (Subaru’s words, not mine). Only seven years later, the brand made a big move with the launch of its 4WD ...
Subaru engineered things to be flat, low, smooth, and balanced-- a good formula for performance.
Boxer engines feature flat, opposing pistons that move in opposite directions for smooth operation. Subaru and Porsche are primary modern users, benefiting from low center of gravity and performance.