I wonder what responses I get for saying this, but nowadays both (as in zoom conference vs in person conference) is possible and both has upsides and downsides.
Online conferences are great to just listen to a specific talk, but other than that in person conferences are just a nicer experience. You can more freely just chat with other scientists, often there is a social evening where you randomly meet people you may not have thought about contacting before.
Now, should you travel around the globe every year several times just for that? Probably not. But in some fields there is one big conference every other year and it hugely benefits you as a scientist to attend these. Sometimes that means travelling from Europe to Oceania.