The thing is Spittle, immersion is a personal thing. For example the FCS Lancaster, if I fly that at night over europe for me that is very immersive as that area, kind of flying and the history of the RAF Night campaign has special meaning to me.
I personally like to fly the 377 over the cub as I like the bigger pistons, no doubt because of my interest in bombers over fighters.
Online one of the most immersive experiences ive personally had was flying in a semi real ATC environment from Humberside down to Duxford. I was int he mind set that I was flying down to attend the flying legends airshow, and with real people doing ATC it was for me a very immersive flight in the default Baron.
I like that alot of people are telling us about the cubs feeling of flight, alot goes on with that outside the default generic stuff (Scott must be hairless coding from scratch alot of elements) so its great to hear that it is appreciated. But as I say, too me personally I just like more than one engine most of the time.