When this kind of process is used, eg in the journey to the NPS in 2004, the range of policy possibilities is well known, documents emanating from the government are of higher quality, there are fewer surprises and better outcomes. Reversals are not important; what is important are the processes of deliberation and thought, and the extent to which they yield good outcomes.
Governments are vast organisations where decisions are made at thousands of places. This raises the problem of policy coherence. Left to themselves, decisions made in different places lack harmony, or even conflict with one another. When these heterogeneous actions are seen by private persons, it is confusing and exacerbates policy risk. Policy coherence comes from principles, from ideas, from philosophy. As an example, through much of the 1991-2011 period, there was an intellectual consensus on the reforms that were being taken. These ideas percolated through the Indian state, and thousands of autonomous decision makers started applying them in ways that were internally consistent. The changed behaviour of thousands of decision makers in the Indian state persuaded private persons that reforms were under way.