As shows get bigger, there's a definite tendency for them to get more diffuse. There are a lot of economic incentives to grow, add a broader range of partners, etc. And before you know it they're about everything and nothing. Vendor shows have some natural resistance to getting too diffuse but there are still a lot of events I attend and I'll see some booth and think "What the heck are they doing here?"
True. That's the main reason, for example, that I didn't get a ticket to I/O. GCP Next had a lot more topics relevant to my interests, despite it having a more "commercial" or "salesy" feel to it. I/O seems to be mostly about Android and Firebase these days.