I disagree. Just build a strong magnet in there (as was suggested, maybe via the speaker). The advantage of the connector would not be the disconnect-on-trip feature, but rather convenience for plugging and unplugging. Namely, it's a lot easier to just have the cord snap it place magnetically than to futz around with the small metal tip[0].

You're assuming it'd either be too weak or too strong. They would calibrate it until it was "just right", as they do (or try to do) with pretty much all of their ergonomics decisions.

[0] Anecdotally, I own both a MagSafe 2 device and an iPhone 5.