Comments and feedback are an important part of the social interaction that makes Steemit interactive. Alex is highlighting what he considers spam posts and people gaming the system. He makes a valid point about resposibilty in that, just because a system can be gamed dosen't make it ok to game it. There is no reward in that. People who game the system can be easily spotted. Constant upvoting their own blogs or comments, that have little to no real content value and zero interaction, for example. Whereas upvoting ones own content is fine, the system is designed to allow that and there are reasons for it. abusing it however, can spoil the user experience and ruin the sociability of the platform for others. Alex and Anton produce some great original content in Crypto nights and offer some valued opinions. You can learn with them and others who support and follow.