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I don't know but in my world, a preference is not a requirement.Which is a moot point. Others live in their own world -- and so can act on their preferences. Besides, even you do tons of things that aren't "required", and thus are just preferences. Even your example is one such: "watching a movie" is not required or mandatory at all --regardless of whether you watch it a home or at the cinema.
>All points besides a, which is not really an argument but the point of discussion, can be done remotely, if you have to travel to a conference.
People don't travel to conferences because it's required or because they can't get the same knowledge in other ways. They travel to conferences because they like it, and because they get something out of going (even if it's not related to the content of the presentations, like meeting other developers/founders/etc face to face).
If your question is "what makes conferences mandatory to attend", then the answer is nothing. But you didn't ask that, you wrote "i still wonder why people physically move from one part of the world to another to hear somebody speak" -- and preference is a valid answer to that.
I travel to conferences because of the reason's I've stated -- and many other people do too. What exactly do we have to explain?
>It might not have your preference, but it certainly is possible and i think comparing travelling half the world, to hear somebody speak vs starting a livestream or recorded version of a conference at your convenience at home, i know what i prefer.
Which others might not prefer.
I'd rather travel and meet people than stay at home/office if I have the chance.