I've never owned a vehicle with a locker, my jeep had limited slip front/rear, bronco 2 has open front/rear, truck has limited slip rear. I've never felt the need to have lockers, or limited slip for anything I do. Not saying there's no need period, but some people buy these traction devices to compensate for the lack of driving skills LOL. The majority of people I see stuck in snow and offroad are people with lifted 4WD's, while the person driving the little front wheel drive Ford Festiva is driving all over the place with no problems at all.
I had once occasion that I drove a Chevy Blazer with the Detroit lockers in it, and it was very squirrely in snow, but that was also the first time I'd driven it, and didn't have a clue it had lockers in it until the 360 I did in the middle of a 2 lane road LOL. After that I realized what the issue was and was very light on the accelerator after that and never once had a problem with it ever again. I still miss that Blazer.