Attacks are more effective when focused on a single part of your opponent’s body.
Prefer to concentrate your attack on a single part of your opponent’s body, whether it be the neck or a limb. Attacks that target multiple body parts at once tend to be less effective because it’s easier for your opponent to power out of attacks using multiple limbs.
The most common illustration of this principle is head and arm chokes. These are generally much more difficult to finish than chokes that only attack the neck.
It could be argued that the general goal in Jiu-Jitsu is to systematically remove your opponent’s limbs from combat until only a single target remains. After all, every positional advancement is an attempt to establish a dominant angle where fewer and fewer of your opponent’s limbs are available for defense.
Isolating a single target is best used when paired with overwhelming force.