I find it a tough one to decide as everyone will be different. Some will say it is easy but if you rely on your income and without it may lose what has taken you years to buildup that's not an easy decision to make.Or NSW comes up with its own list.
Letting the employer decide also means that every self-employed person decides whether their work/trip is essential or not. Which based on all the posts on tradies on this forum, and on twitter, would indicate that they are erring on the side of work as normal as they can.
It also really allows virtually anyone to tell the police if pulled up that they are an essential worker.
The more people mix, the more the virus can jump from person to person.
So it really gets down to how much NSW Health and NSW Gov wants to reduce the level of mixing.
Looking at the numbers they are predicting it will cost half a billion per week in financial help for as long as the lock down goes. Not sure if any mention has been made on what percentage of the work force and businesses are effected though.