I've been playing around with Proximity Charge Launchers a fair bit lately and have noticed a behavior where when mounted on turreted missile slots, they sometimes fire off at nearly 90 degrees towards incoming missiles and end up hitting allies on the same firing line. Given the relative speeds and directions of the incoming missiles, these have zero chance to actually intercept anything and tend to do damage to adjacent ships. I feel like they are not properly checking their field of fire, unlike direct fire weapons like Flak, which don't seem to try to fire through allies (usually). In the same situation, a Devastator wouldn't try to fire through a Legion to get at the MIRV missiles.
Given these are HE point defense, they hurt a lot when they hit allies.
Simple examples can be shown by placing PCLs on an Onslaught and using the sim to go up against a Conquest. You can also deploy an allied capital, get them even, and then spawn the Conquest. Not sure if the check firing lanes logic can be improved, or maybe PCL should be designed to safely detonate before hitting allies, which would waste ammo but at least doesn't have a chance to flame out friendly adjacent capitals.