Theurgist spec...

Air tends to be wasted points unless you go for the DD; the pets stun too infrequently, are shortlived, and get outrun easily, and to top it lack damage without earning you any significant cast time or distance

The only real purpose of air pets is to eat up MoC on casters. If you were thinking of putting 3-5 on a melee and kiting it does not work

The mez is very unreliable due to the amount of det classes running around. At best it too becomes a tool to be used against a MoC caster or cutting off a QC as your pets close in. You can use it to kill a character's accel for the air pets to catch up but they get outrun again without landing stuns almost inevitably

Trying to mix air pets and ice pets further cuts the chance of seeing a stun while the ice pets' snare is constantly not up. What usually happens is the target runs through one of the ice pets with a train of air sprites on him and the pets become moot. The time you spend putting those pets on him is better spent just using straight damage spells

Adding in earth pets to the mix further removes any possibility of stuns or snare earning distance