This is simply false. More pips dramatically increase shield's resistance to damage, and therefore the effect of shield cells.
At two pips, the shields on a Python are about on par with four pips on Asp in the damage the shield can take before collapsing. Going from two to four pip more than doubles the amount of damage the shield can endure.
Not false at all. They make them 2.5 times stronger with 4 pips, true. In a normal fight without shield cells, that would be a great advantage, right? Well, with shield cells, you don't need that benefit, since you can carry enough cells to pop them indefinitely. Why put 4 pips in sys when you can have 4 pips in wep, and have the benefit of maximum firepower, and what is practically maximum shields (you just have to press the button to not die a little bit more frequently, big whoop)