actually it's absolutely the same. in pve you can not do ops if you are 1-49 lvl, you can not do new 55 lvl ops if your lvl is lower then that, isn't it? bolster could be applied to all of these fps/ops, just it should work in different manner for each brackets. like in pvp.
but in pvp I can't choose anything.
I can't choose a bracket based on the skill and gear I think I have, if that was so a bolster wouldn't be needed in the endgame pvp