If true, then it probably stands to reason why crit was left off Mist and if the damage logs are parsed, they're probably fairly equal at this point - I'd guess...
Also, people stating you need a tactic to properly manage a pet acting as if this is a big handicap are neglecting the fact that the pet can be utilized as a CC mechanism with that tactic in place. Choke point holds, keep door push holds, etc. Drop pet, decay it, AOE dmg+3 second KD, resummon pet instantly and build your stacks. Seems like a legitimate use of a tactic to me other than simply using it to insta-summon pets that are easily killed.
While I agree - having the pet not have more HP/Armor/Resists (and AOE immunity) like the WL is a nuisance, and requires excessive monitoring/management, I would also counter that the insta-summon negates that, and provides additional benefits to the Magus. Roaming is much better with insta-summon. Stopping chokepoint pushes is much better. As a magus have you tried to fight a WH with the insta-summon pet and explosive/KD power? Knocking the WH down for 3 seconds is enough time to stack the dots, push him back, and hit Indigo Fire and finish the job.
I agree, Mist is junk. Which is why I cringe when I see people using it. Firestorm crits, and is much better because of that and the snare component.