Benefit of high belt drive tension? I have a Gates carbon belt drive on a NuVinci hub.

I haven't bothered with the the whole tensioning using the app and everything, but I have a set-up where it is perfectly quiet and I've never had it skip.  But the belt feels quite loose.

My question is whether there is any benefit to higher belt tension apart from preventing skipping?  It seems the belt does not stretch and too high a tension causes all sorts of problems like bearing strain, noises etc.  

So is the ideal tension then the tension that's just high enough to prevent skipping but no higher?  Or is there some benefit I can't think of tensioning past that point which is what the app/tools etc. attempt to do?

Thanks in advance!
Don't have a belt drive myself, but a guess would be:
Running appropriately snug (I assume they crafted the app for a reason) would make sure that the stresses and load on the belt is distributed appropriately. Consistent tension on the belt has to be better than a looser belt undergoing stress fluctuations as portions of the belt change from a loaded state (on/between the rear hub and the front crank) to an unloaded state. I expect that higher stress fluctuations on a looser belt would create additional 'belt fatigue' and reduce the belt life.