Connecting your own personal experiences and feelings to your subject didn't use to be important, but it is now. These are all significant changes. Young people tend to have shorter attention spans because they grew up with faster-paced media, which, in the workplace, means they demand that we get to the point quicker. Nowadays, audiences would rather be led to resources they can use if they want to, rather than to sit through a time-consuming, elaborate explanation. What is new are the expectations people have of what a presentation ought to be.
People expect performance dynamism now.
They also expect to get something different from you, something they couldn't get anywhere else. They value their time more, so you better make it quick and you better make it good. It's not good enough just to get up in front of an audience and present anymore, though the best speakers can still get away with that. The stakes are higher. It's more difficult.