I admit my Mech (jade bot) needed a solid nerf. I do not think this was the right one. The point should not be to chase your pet's AI targeting all over the map. Not well thought out IMHO.
If you want to address AFK crap: Perhaps a power drop off or sleep mode if you do not give it orders (attack, f1-f3) after 5 seconds?
Or just drop boon/stat sharing 25% across the board, no range limits.