I lived in Chile as the first cohort in Start-Up Chile. Problem I had with Collectivo's is that I had no idea what their route was. Having the ability to arbitrarily say "I'm here and I want to go here." is very valuable.
I think the commenter's point is that with technology, routes can easily be shared, even commented/collaborated on. Think of it as a more flexible form of public transit rather than Lyft Line / Uber Pool.