Speak for yourself! There are plenty of smokin' players (acoustic and jazz players comes to mind) that play heavier gauges. Even touch/tap guitarists (like Adam Fulara) play plenty fast on 13's.
It's been said you don't choose the gauge, the guitar does. I think this is true to some degree and so, in a way, it's pointless to ask others for an opinion on this subject. Just try different gauges for a while and judge for yourself. Make sure you do the proper truss rod, bridge, etc. adjustments for each gauge change.
Some say the trade-off for sensitivity/responsiveness and light touch is usually an anemic tone. Find you own middle ground. For me it's 10's after YEARS of 9's. Another option is to strengthen your fingers. Buy a cheapo (but decent) guitar like a $80 kramer focus and string it with 12's or 13's. Practice on that for an hour or so before picking up your Rg 1570 for your real practice session... I guarentee you'll FLY all over that thing!
Hmm... this thread should be moved to Players Corner.