She does not. Brigitte is not good at peeling for Ana and can’t really prevent her from being dived. Brigitte “counters dive” because she heals the team and is difficult to dive herself.
Honestly, I think it’s really stupid that Mercy is allowed to have the most reliable healing and damage boost, and rez, but ah, well.
Because she has next to no self-sustain, maybe? 100hp heal from the nade, but then you get very little value out of it. And Zen has passive shield regen.
Yeah, but Ana can’t 2 shot her Attacker now, can she?
Also discord and Trans are so useful that they make him worth babysitting, whereas Ana gets hard countered by all of the barriers anyway.
Not to mention that Ana is a main healer, so if she’s being focused there is only usually a poor healer to help her, but if Zen is being focused, there is a Mercy, Moira or Ana there who can out heal a lot of attacks - or at the very least give Zen time to kill the Attacker.
And, as a last resort, Zen has Trans. Not ideal to use it just on yourself, granted, but it’s often better than dying with it and getting your team wiped.
Comparing Zen’s ability to survive to Ana’s is just silly.