You can’t be serious about mesmers, whole class is designed to have clones, phantasams and illusions popping all over, its main class mechanic and everything about mesmer is based on that.
These are not classic pets we are talking about, and they do very low dmg (except some illusions that are there as dmg skill), and every weapon set has few clone summoning skills, because they exist exactly to confuse oponent, as intended survivability mechanic of mesmers .
What you are asking is for complete class redesign, it can’t be just unavailable in pvp.