[Fyron]

Most MP games do not have very much war with destroyers... and even then, 3 PDCs is not a big investment over 2 PDCs on destroyers and LCs. A PDC ship or two is also still not a big factor. Especially if you do not rush for shields or armor right away, but instead concentrate on CS and ECM (as combat bonuses are far more important than shields or armor, without a lot of research invested into the shields...), so you might not even have shields or armor to use, so that space can have an extra PDC or two easily and not have it be a significant chunk of the economy. And even if you have to give up 2 armors, it only weakens your ships by 2 shots worth of unmounted DUC Vs, or one shot worth of a large mount DUC V. This can make a bit of a difference, but not much, unless your forces are otherwise identical in numbers... 3 PDC is not by far heavily invested in, or paranoid.