Unilateral decisions lead to false progress.
When decisions are made unilaterally, it tends to lead to false progress. You’re unlikely to have buy-in and you miss out on any perspective that the broader group might have had.
Unilateral decisions tend to lead to false progress
Consensus leads to slow decision-making.
When decisions are made by consensus, decisions can take a long time, and may never resolve. The more people that are involved in a consensus decision, the worse this will get.
Consensus is essentially a universal veto which can systemically bog down progress by placing all the burden on anyone who proposes change.