I think of the computer as a tool at the end of the day. It is a very powerful tool which has radically changed how we do things but it’s still a tool.
Lastly it’s healthy to take a break from whatever main activity, whatever that is - could be being on the computer all the time programming or playing games - so that a different perspective sweeps in.
My suspicion is it's because of perceived individualism. Computers may provide you with rich and social experiences, but they detach you from people physically around you, and some people can't stand that.
In my case, I'm trying to reverse the flow and build the life I was always afraid of. I've caught glimpse of it here and there so I know it's not just a figment of my escapist imagination but a genuine interest. I know that many activities leave me more fulfilled than using a computer, but organizing my life so that I can engage in those regularly is the same difficult challenge that nudged me to get addicted to computers in the first place.
By all means, if you've found a life that's inherently satisfying, don't let yourself deviate from it!
Who mentioned spending all time on reddit on new? We can't just take the good non computer activities and compare them to crap computer activities. I don't see why unfulfilling computer activities would be more worse than the unfulfilling non computer activities and vice versa.
For me browsing and often gaming fulfills this description of rich life.