In direct contradiction to that, I ran 33s on stock axles equipped with 4.10s and ARBs. I firmly believe the life of your axle significantly increases with lockers. The real reason more locked axles break is because people who run lockers, tend to run harder obstacles. If you ran the same obstacles without lockers, you would only break sooner attempting them. I never busted an axle shaft. I ran the Rubicon, Dusy-Ershim and Jackhammer on stock axles. Not to mention scores of other trail rides.
One of the advantages I felt I had was that the ARBs are not engaged on the street. If you can't turn the locker off, then it is still trying to function on the road too. This does create stress on shafts, joints, yokes and other drivetrain components.
If you want to do tough trails, you're going to reduce the stress on your axles by being locked. If you want to use your Jeep as a daily driver you're going to reduce the stress on your axles by being open. The solution seems too obvious to me. But, if my opinion was fact, then there'd be no such thing as a locker debate.
On the subject of gears, I ran 4.10s with 33s. I installed the 4.10s when I installed the ARBs which was when I was running 31s. Had I known I was going to 33s, I would have installed 4.56s. So in my opinion, the 3.73 gears aren't even a consideration.
I should qualify my opinion by letting you know I'm not a casual four wheeler. I'm in pretty deep and so my opinion is from a more hardcore perspective. But you should also know that my Jeep is still my daily transportation to and from work. I'm runnin 5.13s in the diff now.