It's not necessary. In fact, I myself have never done it. My first three batches all went eleven days in single stage fermentation before bottling, and they all came out great.
The main thing is to give yourself at least a month between brewing and drinking, whether it's in primary, secondary, or bottles, with at least one week of that in bottles. And the beer just gets better with age. Mine are all much better than they were even a couple weeks ago.