Earlier quoted context omitted.
Define "need". Do you need to breathe? Only if you think you need to live, and the only reason you want to live is that you are wired that way (selection bias, all those who didn't care enough have been removed). Life isn't something objective, you can just decide on what's important to you, as long as it doesn't interfere with your ability to go on living it does not matter. Some people like cats, some people like i…
Need as in "do they offer worthwhile value", which I'm sure anyone not being overly pedantic would assume. You don't gain anything by seeing a live talk that you wouldn't on YouTube for instance. It's weird that so many of us work from home but insist on traveling to see a stage show.
Isn't the interpersonal connection and networking from meeting together at a conference what's really important? The added value of a conference isn't so much what is heard from a speaker but the interaction one is afforded while there.