Against the grain
I would say that engi can be pretty bad in an optimal group setting – not because they’re bad, but because they can be phased out with other classes that do the same + more. Of course, that’s extreme optimization that won’t be found in a PUG.
I’m surprised if they didn’t want engi or thief, though, that they wouldn’t include ranger or necro as well. All of those classes can be phased out and replaced with Ele, Guardian and Warrior for DPS and Mesmer can be helpful for reflects and portals.
Again, though, I can’t stress this enough: that is some extreme optimization that is pretty silly for a PUG.
I’ll even give you engi (once again I don’t agree) but thief! Thieves are highest single target dps with perms blinds and stealth. Why on earth would some not want this in there group. Boggles my mind.
It’s just the whole “optimal party group” thing. I think those limitations are absolutely absurd for LFG…if you want to PUG, grow the balls to accept less-than-perfect group composition (even at less than perfect it’s still pretty kitten good).
I don’t agree with it either, it’s just…possibly the reason? I don’t quite understand the reasoning because even if someone asked for only Wars/Guards/Eles – there’s no guarantee those players are going to be good. I know someone with that kind of attitude would be mad that they ever got my guardian with them…greatsword all day.