There are already two dps-tank jobs, please don't make Paladin the third.

[Aaliyahrose]

I think part of the problem here is that doing anything else with Sheltron invalidates Bulwark on some level.

It could have easily been a "block every attack for the next 10 seconds" type of ability, but at that point they might as well just redesign Bulwark to work like this and replace Sheltron with something else. That might not be a bad idea, actually...

The Sheltron ability was designed block attacks that require timing i.e. Thordan's cleve attack or A3S hand swipe. These of which do enough damage that cause healers to throw out a Cure 2 or Lustrate. It also restores mana, so you can continue to Stoneskin/Clemency you or a party member.