Self-censorship is exactly the same as outsourcing your censor to an authority. You are still hiding things from your vision, limiting your understanding of the world, and choosing to live in a bubble.
Self-censor negative feedback and you'll quickly find that you are apparently the smartest, nicest, coolest person ever. Not because you ARE, of course, but because you blocked anyone who said otherwise.
The toxic positivity on this network is a clear example of that.