Mary Meeker became popular about seven or eight years ago, and at the time, there was an executive summary: "mobile is much, much bigger than you realize."
At the time, many people didn't realize that Android + iOS shipments had dwarfed Wintel shipments until they saw this dramatic image in her 2012 slide deck. https://image.slidesharecdn.com/internettrendsstanford120312...
Since then, IMO, people keep showing up because they're looking for another major shock. But there hasn't been a major shock like the rise of mobile since then. Mobile is still big. China is still big. etc.
Now her presentations convey a feeling of comfort. "I believed all of this already, because I am a smart, well-informed person, and here's the data to prove it."