You help my case here from your guide, I play the Psi shield tactic.
"You will need to Max out this skill and Use any Item that will increase its damage absorbtion. You will basically be Spamming this skill but time it right so that you can get another Shield up just before the one fails."
If you gain an add, or two.. you really have no idea how your Psi shield is holding up because you have no representation of how many HP it has or how much HP it has left. While everyone else can just look at thier shield bar. "oh.. its half full, i have 50% left." Whereas I'm tanking almost blind, or need to practice on new battles to get a "feel" for them.