Lack of suggestions signals a lack of engagement with the implementation of ideas in the space a critic is discussing which signals a lack of correct understanding.
People who only think about ideas but do not try to carry out any plans related to them lack the required knowledge to actually understand problems so their criticisms are systematically over-simplified, brittle, and worthy of, if not outright dismissal, at least severe discounting.
Also, criticism costs critics (almost) nothing and is enjoyable on a basic human level to the critics, so there’s good reason to expect heavy criticism of all ideas… including correct ones.
Lack of suggestions signals a lack of engagement with the implementation of ideas in the space a critic is discussing which signals a lack of correct understanding.
People who only think about ideas but do not try to carry out any plans related to them lack the required knowledge to actually understand problems so their criticisms are systematically over-simplified, brittle, and worthy of, if not outright dismissal, at least severe discounting.
Also, criticism costs critics (almost) nothing and is enjoyable on a basic human level to the critics, so there’s good reason to expect heavy criticism of all ideas… including correct ones.