Part of the problem is leaving funds laying around in exchanges, when it's trivial to transfer to your own wallet (though admittedly non-trivial to secure it, i

Part of the problem is leaving funds laying around in exchanges, when it's trivial to transfer to your own wallet (though admittedly non-trivial to secure it, it's a tradeoff). If you quickly transfer in, exchange, and transfer out you don't need quite as much trust.