A true locking differential - which is basically no differential at all when engaged - can be fine if you have some way to control it.
These things are hard to discuss on general forums simply because the terms and phrases do not mean the same things to all people.
Cars and trucks can be had with many versions of limited slip differential, automatically engaged locking differentials, manually engaged locking differentials, governor lockers, clutch-driven limited slip, etc. Makes a big difference which one someone is actually talking about. Trucks with manual front hubs weren't usually made with anything but open diffs in front. No-hub trucks can be had with alternatives.
My complaint that has also been mentioned by others, it the type of "posi" that makes both wheels spin on it's own, out of the operator's control. And yes, once upon a time, "Posi" was a GM term, but not anymore - just like "Band Aid" was also once proprietary, but now generic.
Main thing is, if you are on an icy road and no matter how soft you hit the throttle - both wheels on one axle keep turning - you can get into real trouble. If you can shut it off until you get rolling, then it usually works fine. If it is governor control and only engages at a certain rolling speed, then again, fine. But, the majority on the road do not work that way.
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