If an individual has grown completely tired of any of the other front ends because of harassment, then they can spend the vast majority of their time on PAlnet and not be bothered by the Steemian, or Leoians or any of the other front end groups. If you are on PALnet you will not see comments from non-palnet users in you replies box. Like wise you will not see comments you made to non-palnet post in your comment box.
THIS. Separate tribes. Separate comments. The comments aren't "disappearing". It's an intended feature IMO.
It is, and I think an important feature. You can still earn steem coins and PAL tokens. People confuse what is decentralized and what is not. The block chain steem is decentralized, not the tribes, they are like private little islands sprinkled through out the steem block chain. Make to much of a ruckus, harass to many island dwellers, and it back in the ocean for you; to swim with, or be eaten by, the other sharks.