Khoa Vu

I can think of several points: 1. Being able to catch up with the fish if it darts towards you after hook set to minimize slack line time. 2. Being able to reel line in faster after your lure has left the strike zone, which effectively allows you to get the lure out there again in the strike zone faster. 3. For sight bank fishing, if you see a fish while your lure is in the water, faster GR allows you to quickly bring the lure in and present your lure to the target that you've just spotted.

Phenix Feather + Curado K/Tatula SV with some shopping.

I am right handed. I've only recently got into using baitcasting reels and tried a few of my dad's RH reels, it just did not feel natural to me. It feels natural to me to have the rod in my dominant hand for feeling bites and for hooksets and leave the easier task of reeling in line to my less dominant hand. It also didn't feel efficient having to switch hand after casting to me. Though with practice, like many other users have pointed out, it does become second nature after awhile. Again, to reiterate the comments above, it really is a personal preference thing. Do what feels natural and gives you the most confident in catching fish. Try things out, don't just go with what people suggest is the best thing for you, for they are not you.