Why did debunking biographies lose favor by World War II?

The trend of "debunking" biographies, which sought to expose the flaws of historical figures, lost favor by World War II because the style was largely discredited.1

While the work of Lytton Strachey in the 1920s and 1930s—characterized by irony and artful selection—inspired many imitators, these followers often lacked his literary talent and skill. Consequently, the market was flooded with works that prioritized zestful, superficial exposure over genuine insight. By the onset of World War II, it was widely recognized that Strachey’s true value lay in his adroit detachment and literary craftsmanship rather than his "dangerously interpretative method," leading the genre to move toward a more steady and established form of literature.1