I have owned three Subaru Outbacks (1996, 1998, 1999) and all three required head gasket replacement. That was a $2,000 repair for each and every one.
I've also owned at least 15 other vehicles of various makes and models over the years and none of them required a head gasket replacement even though they all had well over 100,000 miles on them before I bought something else.
When I hear people repeating the Subaru party line that goes something like, "no head gasket problem here," I can only point and laugh.