You have to quit and start the job at some point. You might also hate it after a week. The trial at least gives both sides a lower risk way to test each other out. You could take a weeks vacation, or surely would be able to negotiate a week to do real trial work before you are forced to quit your job.
This is actually common in some trades, for example cooking / baking, and makes way more sense than interviews for both sides to decide if they want to continue working together.
This is actually common in some trades, for example cooking / baking, and makes way more sense than interviews for both sides to decide if they want to continue working together.