If you look at technological advances and how they affected society, dramatically changed things, then the following would be huge achievements, huge leaps forward, relative to their times (pre-20th century), perhaps made even greater changes in society than the technological advances of our time.
harnessing fire
domesticating animals
using metals to make tools
invention of the wheel
invention of paper, then printing press
discovery/use of electricity
today these things seem simple, but only because we are so used to them being around. But arguably, these were more important than video calls, even if the latter is way more sophisticated. And as pointed out above, technology of today would not exist if these earlier advances had not happened.
Here’s something I always wondered about- with today’s rapid pace of advancement, how come air travel is more expensive, less comfortable and no faster than it was 40 years ago? In all that time, no one could come up with a cheaper (i.e. not dependent on oil prices), faster way to fly people from one place to another?