It started this morning but was NOT happy about it. I didn't simply lay on the key for 2 minutes; I used 10-second "bursts" with equal time between of the key at ON position.
FWIW the battery has plenty of juice; the starter cranked good & fast through the whole ordeal. Friday night/Saturday morning it didn't slow down at all until after the 4th or 5th individual starting attempt.
I will phone Subaru and also make an appt for service AFTER verifying that this will all be under warranty AND that I'll have a loaner vehicle for the time it's in the shop.