I'm afraid I have to disagree with your statement. What works in PVP does -not- always work in PVE. The PVP situation is rarely one where the player is swapped by enemy targets, and most often, a player in PVP is solo. In PVE, a player -can- find themselves overwhelmed by enemy numbers, and often has to work as part of a team in the upper-level PVE encounters. I've personally seen players fail a PVE encounter because they could not attract the attention of three enemy groups on different bearings simutaneously, and lost an objective because of that.
So PVP is not the only meaningful metric, unless all you do is PVP. In that case, I can see how PVE play would not factor into your calculations. However, even in PVP, there are occasions where you want to damage multiple targets at the same time. Builds that specialize in single-target attack, such as cannon builds, cannot do so, and it is a limitation that has to be kept in mind when flying such a ship. This is especially true in a Cruiser, which is built to take as much enemy fire from as many targets as possible, and not for damage output.
Still, it's the commanding officer's decision how to use their ship. People can take my advice or leave it. The results of their missions will verify if their decisions were the right ones.
Ever been in Kerrat? I am "swamped" by Klingon PvPers all the time, and they do a lot more damage than those comparatively weak and pesky PvE ships. If you want to grab attention of three targets at a time with an Excel/Cannon/Turret? Fire volleys and rotate targets while flying close to them, that'l set off agro for sure ( I do it all the time, and it works). Or tractor one target and hammer another.