The key part here is professional context. If you've met that person because you are both attending a tech conference it's very different than someone you've met in a purely social context.
My only reply to that would be that I imagine a significant amount of couples met originally at work in what was likely supposed to be a professional environment.
I'm sure you're right, and I'm not saying it should never happen, but that it's a different environment that you should be aware of.
Tech conferences are a little different than the average workplace, too - it's not as if you have the time to get to know a person, or usually live anywhere near each other to be able to form a relationship.
