Just for the record - I've never proffered the notion that Harleys
are more reliable.
Just know that I've never had any particular "reliability" issues with any I've owned. But - are you say'in Jap bikes don't break down or have flats etc.??? Asian dealerships and good/timely service can be a little sketchy in many rural areas and God forbid you break down on a Ducati, BMW or Triumph etc. in the middle of no where. Only a miracle would have you closer than a couple hundred miles to the next Dealer.
I ride Harley's with confidence that if a part or service is needed - it's nearby - hell most hick auto shops have a mechanic (or two) that can wrench a Harley.
And by the way... HD improvements/advantages - super durable maintenance free belts, fuel injection, one cylinder kick out for cooler riding and lower engine temps, big footed fool proof kick stands - no mods necessary, real chrome, FOB ignition with back up code - never leaves you stranded (no lost key buffonery), largest OEM and Aftermarket for personal tweeks, mirrors that work - you can see more than the logo on your shoulder, leg room, tires that don't have to be changed every 6 K miles etc.