From a Necromancer's PoV (and if it is totally irrelevant, please disregard):
My level 20 pet (Grim >something<) is a caster, whereas the Tellurian Recruit was a tank. If the AI on my caster pet were better, it'd make a helluva pet; as it is, it loves to run into combat and THEN try to cast spells. If your Conjuror follows the same general model, I'd bet that your level 20 pet is capable of something your TR isn't.
SoE is really into giving classes tradeoffs to deal with. If you get ability X, you have to sacrifice ability Y. Sometimes the tradeoffs prove even. Sometimes not. In this case, I don't think that the pet makes up for lack of inherent class dps. Since Necros are (once again) not high up on the list of wanted groupmates, I am forced to solo extensively, whereas in EQ1, I generally >chose< to solo because I could.