I think this was actually fixed at one point and then it broke again in another patch. I notice the bug a lot in pvp as minion master necro and can best describe it as severe lag in minion actions to the point where minions will just stand still off point while I’m fighting the enemy team.
Also, I agree that ranger pets are much better but obviously I know nothing about the GW2 back-end so it might not be possible to simply use the same ai for minions.
I primarily use minion master necro in pvp (because it requires no skill, ohoho) so any improvement to minion ai would be appreciated.