Mostly just a personal choice.Why?
I've thought that basically falling out is a feature, not a bug but I don't know what I don't know.
I have had the SCS slip forward when I wasn't paying attention with an AR open. User error? Of course. I'd rather not have it be able to get in the way or hit the floor when I forget about it.
The problem with the SCS and using a regular buffer retainer pin, is the pin will catch on each weight and be a pain to depress when you do want to remove the SCS. The JP version lets it slide past the gap between the weighs.
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