It depends on what the talk is about. Of course Steve Jobs' of cited iPhone introduction didn't have any details for in depth research later on, but was a high level product introduction.
A technical talk however explains a concept, a tool or something and thus contains technical information to follow up with, but for that I need the words, the phrases stated so I even know what to look for in the manual. And probably I want to follow it in the order they presented it (I hope they thought about the order they presented it in!) however the manual is ordered more in a reference order.
So yeah, if you do a high level marketing talk it doesn't matter, but then I also won't spend the time on watching a second time. If it has technical depth, then being able to follow the depth is good.
A technical talk however explains a concept, a tool or something and thus contains technical information to follow up with, but for that I need the words, the phrases stated so I even know what to look for in the manual. And probably I want to follow it in the order they presented it (I hope they thought about the order they presented it in!) however the manual is ordered more in a reference order.
So yeah, if you do a high level marketing talk it doesn't matter, but then I also won't spend the time on watching a second time. If it has technical depth, then being able to follow the depth is good.