The question is whether the small improvement is worth the potential additional wear, if that will bite you in the arse before you want to get rid of the vehicle.
I can rev it faster quicker, more performance, more win. Yeah, there is always a tradeoff even if it's just that you drive it more aggressively.
Maybe just buy the most appropriate viscosity for your engine and climate? I know, it's boring to do the right thing. Certain forums have many topics about being a masochist instead of just following time tested, proven... wait, do I smell nachos?