Last Blizzcons don't count, I'm talking 2009, 2010, 2012. These were epic panels, at least 1 hour long. And you could see they put work in their presenations. There were systems panels, class panels, lore panels, art panels. Good stuff. And the devs back then had a sense of humor and didn't take themselves too seriously. They had honest interactions with the community, not the scripted bs we get today.
To be honest, every Blizzcon after the WoD announcement was a letdown.
Look at this for example
2010 Quest & Lore Q&A
https://www.youtube.com/watch?v=E7fVTabpyf8
(1 hour) with the legendary "Red Shirt Guy" at 24:35. Can you imagine a panel like this nowadays? The real shame is that Ion participated in these panels back in the day. He knows what is possible. He knows the players enjoyed these panels.