Want a simplified answer? No.
Unless, you want to expand your flock through your own birds, then obviously you'll need one, even then however, one can buy fertile eggs for a broody duck to hatch out without bringing a drake in.
I own drakes, actually quite often, i have several due to breeding. I also keep call ducks in pairs, so i have two there as well. Drakes complicate things and bring an entirely new dimension, some things are positive, other things er? not so much.
My main drakes, which are two, do fight and can be handful because of that, they do patrol with their ladies on occasion BUT drakes don't protect like a rooster does, so don't expect that aspect, i find there in the middle with this, i have seen mine be with their ladies but just as often be somewhere else, mind you i have some pretty independent ladies lol
Drakes have to be raised with proper lines drawn, in other words the pecking order must be well in place, they will try to be over you as the keeper, so they have to know your not part of the flock and are in charge.
As well, some can be handful with the ladies themselves, being excessive with breeding and some are known to kill ducklings, so separation maybe needed.
I am fortunate my drakes seem to tolerant the young that have come through the flock, and also leave brooding/nesting ducks be, although if they didn't they wouldn't be here lol I do have to separate my mature drakes at night though, in confined spaces they fight.
I started into drakes because i had a straight run, if i'd had a choice, i likely would have never added any but the ball was already rolling and more have been added each year as they breed, mind you i usually sell off the extras.
So there is my long, drawn out ramble, or refer to the simplified one.