I have 16,000 documents, 5700 photos, 5000 tunes and 30 movies (plus apps) on my 256GB Mini and still have 95GB free. And I don't need all that for day-to-day activities on my computer. I also have a pocketable external SSD, where I maintain a manual backup as well as files I really don't need to have on my computer, but are there when I need them.
Then there's my external Time Machine....
I get the fascination with having more and more onboard storage - especially if the user comes from an earlier Windows machine, where large storage capabilities was always a selling point; or an era when the onboard storage on a laptop was the only convenient way to carry everything - but I think neither hold true anymore. I think people have learned to be a lot more selective on what is on their computer, maybe keep some of their 'nice to have' stuff on external (or cloud) drives, and are also more cognizant of the fact that if the laptop they have everything on upchucks, its really not a good idea to have relied on one drive.