You may not realise this, but the world is bigger than just the USA, and BMW is a German manufacturer. Whether a manufacturer has made a vehicle for the US market or not has no bearing on their expertise, as I am pretty sure that the rest of the world has very similar roads and tracks to ride on. Sorry, but there is nothing unique about your roads, and I'm pretty sure BMW didn't design their bikes just for the American rider and roads.
What exactly is so fundamentally different between an adventure styled motorcycle and any other motorcycle, especially when both manufacturers have been making such bikes for over 30 years.
The argument that BMW has been making such bikes for a few more years and therefore must be better at it is tenuous at best.
I've heard all the arguments before and have to wonder how much BMW are paying you for spouting such gibberish.
I've heard you say, ride the bike that puts the biggest smile on your face. I agree, but would also qualify it with, also ride the bike that is not going to threaten to wipe the smile off your face. Personally riding any bike puts a smile on my face; large or small, fast or slow, heavy or light.
I bought into BMW, I rode their bikes, I was let down by their reliability, I was let down by their dealer network. Fool me once, shame on you, fool me twice shame on me, I'll never buy one again, especially when you consider that since I owned one their reliability has got worse not better.
I will agree that BMW make attractive looking bikes, that package innovative ideas and market them as if they are essential, but I am happy to admire them from a distance because my bike choice is influenced by experience and not a spec sheet.