It takes practice to learn to be ok with the lack of focus in the sight picture especially if your used to aiming with one eye like me.
IMO There are a couple of advantages that I've found so far using both eyes.
1. Your expand your range of vision by having the other eye open which could allow you to see something that you would have otherwise missed.
2. Which I think is the biggest advantage for me, is when I have both eyes opened to aim, the sight picture through the peep and scope housing aren't nearly as crisp in focus as when I use one eye. Don't get me wrong I can see the pin clearly, and the target clearly, just not the peep and scope housing. It might sound counterintuitive but is not, at least for me it isn't because it allows me to relax and let the fin float on target. Which in turn gives me the ability to work through my release and increases my accuracy. instead of having laser like focus on my peep and scope alignment I'm focusing on my firing engine.
I'm still no expert but I'm really trying to become more natural with both eyes open.
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