Midgitis are you sure you play pup?
Pup is a Fantastic tank for alot of content. not everything, but pretty close, and its is the best tank for some things.
Have you ever Seen a full DD build automaton? Overdrive or not?
even if master doesn't engage, its not hard to pop 20~30k skillchains. Thats a good dd, but its auto only. master won't add as much, but when drop 2 step skillchains ini the time other dd's do single weaponskills, and the automaton gets huge bonuses to skillchain damage... you deal really good damage.
Healing and nuking are not done so much lately. I'll agree on that much. I've taken a pup to a Magic burst CP party. Its not as good as a blm, and I could use some more practice and actually use some pet mab gear cuz I was only using Tali'ah set, but I could still drop some good magic bursts.
Healing, is usually done better by a trust than an Automaton, but I think thats because no one practices it just like there are relatively few ppl playing whm seriously.