If you think about ALL the new bikes. At York, they all come off the line, go into the dyno cell, fuel line hooked up, computer hooked up, run up to temp, they do a full run up and down through the gears to about 85mph reading in 6th. It's the same room(s) they use for the Tri-Glide also, except they don't have the back half on, just a little (what looks like compact spare) tire to be able to push them around, and hook them up to the rollers. Anyone taking the York tour will see what I mean. It would seem to me that the bike is "good to go" without having to worry too much about break in. Moderation in your riding helps! Besides, if you blow it up, don't you have a warranty??? LOL
I don't baby my bikes, either stock or built, and have never had a real problem and get high mileage on most motors (big ones don't seem to last as long....Hmmmm...wonder why??) JMHO