Creating a plus / min balance

People tend to criticize, and few people put forward constructive thoughts. Such is the social nature of man. Therefore, for example, in order for the work of the team to be productive, in one of the models of interaction of team members, there is a “staff critic” among the roles to be distributed. Thus, the whole team can put forward ideas, but only one or two adequate / respected / knowledgeable team members can criticize. This allows the team to work more productively. Since we are here on the site, of course, we do not pursue high productivity, but still expect adequate criticism, I have the following suggestion:
Each participant can distribute unlimited pros, and the number of minuses can not exceed the number of pros . Those. until you encourage someone, you can not criticize.