I know several rather lovely people who have suffered from chronic depression or anxiety. Its sad to think that so many people would rule them (and me) out as potential partners.
I guess its like anything else. You wouldn't choose to bring the heartbreak of any kind of illness or difficulty willingly into your life but when you love a person who has/developes a condition then you have to decide if that difficulty is a barrier to the relationship.
When we talk in the abstract about 'depressives' we are forced to reduce a human being to a bunch of common (but not universal) symptoms which don't actually encapsulate their personality or qualities.
So in the abstract, yes life would be easier without the difficulties of depression, but it would also be easier without cancer, or ms or any other condition. I think if you rule out people who have suffered from severe depression from your list of potential mates, you are ruling out a lot of potential love, creativity, intelligence and kindness too. It is of course your perogative.
I wouldn't choose to date a serious condition, a bunch of symptoms, but a person with such a condition, quite possibly, yes. As others have stated, it would be important for trust that the partner was honest and was able to talk about their condition and practically what support they'd seek if their condition returned, and what symptoms to look out for. So yes, a sense of self-awareness and openness would be appropriate, though these are traits I'd look for in anycase.
I'm not going to belittle those who have said they wouldn't as it often seems to be from experience and you know what you are prepared to have in your lives. (Not me, clearly). My experience is that depression affects all kinds of people, some of whom I'd live with, others I would not, and it effects them in different ways, so I wouldn't exclude a partner based on a history of depression.