We have a big conference every year where I live for the tech industry. It's hit or miss depending on the person presenting, and it's usually a miss. Many talks can last over an hour when they could've been a much shorter youtube video and are just there to pad time. Also 95% of the people are there for other motives. Looking for investors, trying to get hired, browsing the booths, etc. Despite being very crowded it's very clear most of the people don't actually care about the talks and do anything else on their phones.

I think in-person conferences can be great experiences when done right but I really got anything out of it. For all the talks about networking with others they give very little opportunities to do that. When everyone is looking for opportunities from other people it felt almost like a competition to try and talk with companies and important people, and it usually boils down to them asking for my contact info so they can flush it down the toilet. I don't know, I just have a bad experience with them.