Going by this logic, everyone has access to some form of healing or self healing, everyone is a healer. Everyone has access to a form of defensive buff/cooldown, dont die to stuff in 1 hit and has a form of generating aggro, everyone is a tank.
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You mean 4 DD a tank and a healer, Summoner can heal and Titan tanks
That wasn't 4 dps. That was 4 dps and a tank. Do it again without the pet tanking and then. You can come back and say you truly did it with 4 dps.
NEXT!
It doesn't have the same impact when you have a summoner in the group, because a good summoner counts as a DPS, a tank and a healer.
I'm not saying it's an empty accomplishment, but it's definitely lessened by the use of a class that fills in the holes you were trying to leave empty on purpose. Especially when we know that summoners have been able to solo some of the dungeons already.