Oh, right, I'm thinking in WoW context without really explaining how pet classes in WoW worked. All pets scaled with their master's stats, and also all had inherent damage reduction (I think it was 80%) taken from AoEs. If a pet was dying during a raid fight, it was because it was pulling aggro and the guy playing the hunter/warlock was an idiot that forgot to turn off growl/torment. I'd expect a similar mechanic here, where Avatars would scale with their SMNs stats and also have an inherent mechanic that reduces damage they take from AoEs. Then the game becames about using and focusing on an avatar and, most importantly, keeping the avatar alive.
Believe me, I'd hate to place such a restriction on SMNs, but I also know that people who graduated from FFXI will try to twist every mechanic they can, and in order to deter it I can't think of something less than a direct kick in the balls to those players.I am in favor of the No perpetual cause, and the more mp to do abilities just not a crippling amount, but it would even out if the cost of summoning was a decent amount to, back to the aoe problem if its alot your gonna got out of mp after your pet dies 3x. So a Summoner should IMO have a refresh even with a Summon out.
On refresh, without a doubt it should be and is shared by the caster classes/jobs, so I don't see why Evoker/SMN shouldn't have it as well.