Damage reduction applies to her toggle shield health pool too, though, right? So DR on Gali is more useful than it seems just looking at her base health + recharging shield. As far as I understand it, this is also why Boldur is so stupid hard to kill (that and his ability to heal via shield after lvl 5.)
Being able to simply step in front of your healer and shield block that incoming Paradigm Shift, Bindleblast, Blade Launcher, Hawkeye volley or whatever is nice. Sure Kelvin and Attikus can just leap and eat it too, but it’s not trivial that Gali does so without taking damage.