You don’t have to, but it can certainly feel great on the water. Doing this will allow you to move at a higher speed while simultaneously improving the maneuverability of your boat.
Of course, smaller motors can be satisfactory for users that aren’t very demanding, and they can be budget-friendly too. But, if your motor needs to perform, be sure not to undersize it and always take into consideration the boat size, weight, and conditions on the water.