Two reasons.
First, yes, to reset, but also to emphasize what the government priorities are in a changed circumstance, or if it's getting lost in a political debate that is starting to go ahead....
Second, if you look at 2020, this was a government that was tired. This was a government that was under a lot of pressure. This is when a government makes very serious mistakes, and they are exposed to the public as failures of government, malfeasance or misdemeanours of some type, when in fact they're due to errors of exhaustion.
This gave the government and the public sector time to regain their energy.