You can be exposed to the world and become a good, grounded, and capable person without spending an inordinate amount of time on the internet. We did it for the entirety of human history prior to my generation (millenial).
If anything, from my experience at least, spending a lot of time on the web makes you more isolated and prone to group-think. I want my kids to meet people of diverse backgrounds and experience things in the real world, not live via someone else they watch on the internet.
Do you have kids? You will socially ostracize your middle school kid if you give them zero access to the internet. The way kids interact with each other has changed.
Just limit their time on the net if you are worried about internet addiction and isolation.