I am convinced of the "need". I was convinced in 1998 when I ran an ISP and had to process a huge database. Stick with me for a minute please. When I first started processing the database, it took a few minutes, as time went on, and our business grew it took increasing amount of time, and eventually I was unable to process the database to summarize the data in a timely manner. I upgraded the computer and the data processing went from over 1 hour to three minutes.
That is when I realized that speed doesn't equate to how fast things get done, but rather whether or not you actually can do something. This is key, because if you cannot do something because the computer cannot do it or at least cannot do it in a reasonable amount of time, you end up not doing something, so that something doesn't get done. It is a loss of productivity.
Computers, above all else, don't offer us Word Processing, Spreadsheets, Databases, Presentations or whatever. They offer productivity increases that are almost invisible to casual observers. Pulling data from a database, inserting it dynamically into a Presentation Slide is productive. Giving that presentation using Live data is amazing. In 2000, that was nearly impossible to pull off with Office 2000.
And now, instead of having to prove the data in a static presentation, all you have to do is approve the source, and let the data present itself, dynamically.
Do most people, not use this capability? Probably. Does it mean that the powerful hardware doing multiple things (Presentation, Processing live data simultaneously) isn't necessary, hardly. Do not limit me by what "most people" do or need. I am not "most people" and in fact, "most people" aren't like "most people" in some form or another.