PPC's are, in essence, man-made lightning. And yet, their portrayal in-game is of point-point damage delivery. Thus the current meta.
However, do a google search on damage inflicted by lightning strikes to the human body:

Heck, just look at the PPC blasts in-game:

Obviously, neither look even close to coalescing to a single point. Even the blast itself is a stream of pulsing energy strands. So why not have the PPC blasts scatter across an area of a mech starting slightly off-center of the target point and skewing in a random direction?

This maintains the power of the PPC, keeps with the lore of it being a lightning-based weapon, and is a passive nerf to the pin-point damage meta currently dominating the game.
Okay. You may now start flaming me.