Yes i do agree... But as a group, it can be as easy as all hell to take him down. The fleshpound is all about killing a single target and moving along. But just common sense, If you were a huge monsters with huge spiky arms and went after one specific target? Wouldn't you hit other players in your way. Not just go by them and wave at each other like you guys are friend.
With this idea, It could change all that. The fleshpound can be harder to take down in a group. Tho they will need to fix the fleshpounds pathing way, Not making it run around in circles or run in a different direction than run to the targeted player.
Sure, as a group it can be easy to take him down.....
Provided everyone is co-ordinated, equipped properly, knows what they are doing, and aren't being swamped with hundreds of other dangerous specimens.
Such conditions only occur vary rarely.
More often than not, you are playing on a team of people with less than level 5 on every perk. More often than not, people will go with whatever weapons they prefer, as opposed to seeing what others have and choosing accordingly. As such, fleshpounds are not always a walk in the park, unless someone is intentionally equipping to deal with them.
Now, raging through people or not, if the FP is, as you say, incredibly easy to kill with a team, it wouldn't matter wither he hit people on the way through, because as you say, he's so simple to take down, right?
The problem, is that fleshpounds might not be much of a threat (not much is) when everyone is aware, organized, and equipped. Fleshpounds usually are a threat when the whole world is going to hell in a hand basket and everyone is fighting for their lives. In such a case, a fleshpound could simply waltz in from an unnoticed angle, tear through the entire team with a trail of zeds behind him, and wipe the team.
Let's face it, for all his badassery, fleshies are specifically designed to go after one target at a time, to give players a fighting chance. The only thing that can pretty much rape the entire team, and is designed to, is the patriarch.