Thats not locking the player from faction jumping and if there are 4 factions and we are given one slot per faction the concept of character slots filling that role is nonexistant As for xp amd being wiped, also irrelevant for this purpose when you can just have a character on each faction at varying levels. Plus relevelling never stopped the imba faction train for planetside 2 and thats a much more complex game meta wise so far.
The amount that the storm shield can take is completely fine, what is not ok at all is it block damage from the sides and back which happen constantly regardless of lag, fps etc. It should have 2 places it stops damage from, the front when held and the side it is on when running. It's great that you can kill them but that doesn't mean they shouldn't be fixed. If the MoN had a shield like this the entire SM faction would cry and it would get nerfed to the ground, which has already happened multiple times with the MoN. Being able to stun them does not mean there isn't an issue with the protection radius.
this video needs to make the rounds again. Too many unicorn sightings involved with current shield bro discussion.