Apart from the reasons listed below - which includes an attempt at airbrushing the (tattered?) image, it's also, as it appears, designed to further tighten the vice-like grip of the PMO over individual ministries.
Hence, (mostly) faceless ones replacing somewhat known faces.
<<Prime Minister Narendra Modi on Wednesday expanded and shuffled his ministry, dropping 12 incumbents, recruiting 36 new members and promoting 7 ministers of state in what appeared an attempt to refurbish the image of a government scarred by Covid and economic mismanagement.
The replacement of a host of senior ministers with fresh inductees is being seen as an exercise to safeguard Modi’s reputation as a leader who means business and create a distraction from the problems besetting the people.
Government managers went to town hailing the “youngest council of ministers ever, largest representation of women, backwards, Dalits, tribals and highly educated people”
However, it was the exits of heavyweights such as Harsh Vardhan, Ravi Shankar Prasad, Prakash Javadekar, Ramesh Pokhriyal and Santosh Gangwar that created the bigger flutter, appearing to reflect a government acknowledgment of failure on key fronts such as health, education, labour, IT and information and broadcasting.
While health minister Harsh Vardhan’s sacking caused some surprise despite the mismanagement of the Covid second wave, the departures of Prasad (law, IT) and Javadekar (I&B, environment) caused the greatest stir.>>