Yeah i think you are right here. No one should even be using the tanks to get to their shields. It's not very hard to walk off the tank and get to your shield within the (10?) seconds defensive systems is being cast.
I've always used the tank's KB to get myself into a shield to try put in as much extra hits / dps as I can (this was back in Hard Mode though). I think the point of that certain discussion was if 1) getting KB deals enough damage to warrant walking away as soon as possible to avoid the KB's damage (which was proven negligible ~830 damage as per Kemonotic's parse). Walking to a shield bubble or getting KB = personal preference (imo).