Smartphone UIs are a devastating blow to humankind. They make a real computer just redundant enough that people buy smartphones instead of computers and then just don't do anything that can't be easily done on a smartphone. Furthermore, as doing anything productive is so painful on smartphones, people just passively consume stuff instead.

My phone conveniently integrates the functionality of an emergency communication device with the old calculator watch I used to have. That's about the limit of what the hardware form factor can do without it being an absolutely miserable experience. I don't do real computing on a touch screen.