Meanings of major reappraisal in anglès

He warned a major reappraisal was needed to ensure Britain did not lose influence on the world stage.

As longstanding structures of gender, power and privilege undergo major reappraisal, masculinity finds itself in a state of flux.

But I don't think it will trigger a major reappraisal in society or the country as a whole, with genuine self-criticism regarding the Cultural Revolution.