Not the power but . . . Oh . . . the torque from a big V-twin powering out of a slow curve . . . That. That you might need.

Well if you are going around mountain roads, Full boxes and panniers and a pillion then yes you need it as you will kill a 600 after a while. If it’s just you and your cock no

the straights is where i would need it...either way i hate the sound of a typical i4 and want to be able to have enough power to literally throttle only wheelie at 80mph and easy as hell to work on. Hence why i ride an R1 that sounds amazing and is easy to work on and has an entire diag and code chcing system integrated intot he dash that allows testing and cycling of every single component

Heck, 250 cc is fine. Many of my bikes are 70cc and could corner faster than a big bike. Easily. 

I ride a 125 in the UK and an 1100 in Spain. I enjoy both.