Makes no difference, Mike. I'm pretty sure Neo, Bebe and H1 all have off-road (adventure series) packages and they blow front diffs as fast as photos are photochopped on this forum.
What happen is if you meet a maximum restriction such as a boulder, tree under water, etc., and you apply a lot of engine torque to go over the obstacle, the front diff tends to flex (it's aluminum), thus allowing the pinion gear to ride up over the ring, and start chipping teeth. Once this starts, it is not long before they start breaking.
Newer vehicles, and service parts diffs and ring/pinion gear sets have been hardened to help reduce front diff failure, but I personally don't think it is the true cure for those who really off-road on extreme trails.
A locker MIGHT help a bit to help you go over the obstacle faster with less torque required to the front diff, and I guess in some cases that might be true, but I'm not sure.