What's the point of binding the basic attack key?

Topic. I see a lot of players binding it to high priority keys, but I don't understand why. It can be triggered via any targeted skill - even if it's on cooldown and/or out of range. It can be disabled by using the stop attack bind if you'd like to remain on target, and you can always click off target to stop attacking and remove target. I feel like I'm missing something, but I don't know what it is. Thanks.