Plus, she's got some strong offense. She's classified as support because she supports the team, not necessarily because she heals. Although it's still worthwhile to have some sort of healer. On attack anyway. But why you'd be playing Symmetra on attack is beyond me.
As far as Ana is concerned, I'm still undecided. I don't want to play the beta because I like loot, and I'm in no rush to play her. I don't particularly enjoy snipers, and it seems like her only close quarters option is to CC and run.