You are the one getting the surgery so you need to be comfortable with the surgeon, it doesn't matter if any of the staff disapprove.
Although the odds are extremely high you will have a good result no matter what surgeon you use these days in a modern country, studies do show that experience does improve the results with cataract surgery, and high volume surgeons on average have better statistical complication rates than low volume surgeons. This study shows a lower complication rate among surgeons who do more than 1,000 surgeries per year:
http://www.escrs.org/PUBLICATIONS/EUROTIMES/07May/Lowcomplicationswith.pdf
I had seen another similar study sometimes in the past few months but a quick search doesn't seem to turn it up. Obviously skill plays a part also, but practice helps. In addition, fortunately complications are rare, but that means a low volume surgeon might encounter a complication they haven't seen before and not handle it as well as a surgeon that had dealt with it in the past. Again, I should emphasize that the statistical differences are minor, the odds are that you'll get great results whoever you go with. I just figure that if you have a choice, you may as well go with the best surgeon you can find. Obviously high volume surgeons are hard to find, though I would personally be cautious even about an older surgeon who had done 5,000 surgeries if for instance he'd been practicing 20 years which leads that to only be 250/year.
The surgeon I used in Europe had 40,000+ cataract surgeries, but that is atypically high. Since I was traveling to get surgery however I figured it was safest to get the best surgeon I could find even if the odds are it wouldn't make a difference (though partly since I did have a US surgeon claim that standards are higher here than in Europe). I suspect unfortunately that the number of surgeons in the US likely leads to fewer high volume surgeons.
Yes. You need to be comfortable with the Doctor. I hope you plan to meet with the newly selected doctor before the surgery. Best wishes.