I believe it was stated before that Anet would like to "reward" players for having good positioning with your pet. As it stands if you have even half a toe outside the very short range you instantly incur the penalty. Before you had about 8 seconds to get back into range which was ok for the most part.
This is just a cruel change punishing mech players for things almost entirely out of their control.
Not to mention using the ranged arms is entirely out of the question now for power mech.
A nice change could include a buff for keeping your pet within range to give it a sense of high risk high reward rather than completely punish for not being able to keep a pet leashed that has the brain of a goldfish.
Overall this change makes it feel like Anet really does not want people to play mech.