That really makes no sense, as the battery will always be HOT while the NEG ground is connected. Anything touching the POS will cause a spark connection while the NEG is stilled grounded.

With the NEG disconnected, you can touch the POS all day and not cause a spark connection. The only way to dick that up is to have whatever is touching the POS to simultaneously touch another metal component and cause an arc.

Without a doubt, having the POS connection covered with a normal rubber battery boot, and having the NEG with the quick-disconnect is the safest choice. In my opinion.