Interfaces and marketing that use "my" always irk me by, for lack of a better phrase, coming on too strong . I'm all too aware of the human hands that typed out that button label - it seems damned impudent of them to be assuming my voice. It implies a certain intimacy. My cart sounds like an appropriate label for something I've filled, but so long as it's empty trying to foist it off as mine just comes across as a de…
Having said that, there are situations where those traits may be appropriate. If some kind of intimate or emotional connection is the point of the app, it makes a certain sort of sense.
I also realize my bias against that sort of presumed intimacy may be greater than the average person's.