Why using a single-bladed lightsaber then you can double your damages using a double-bladed lightsaber and two advantages?
Of course, the Unwieldy 3 quality limits the use of that weapon for characters with 3 in Agility, but is iy balances the Linked 1 quality? With that official rule, most lightsaber fighters should have the objective to get a double-bladed lightsaber to improve their efficiency in combat.
I propose the following house rule: the Linked 1 induced extra damages can only be inflicted to a secondary target. This can explain why Darth Maul uses a single blade in his first duel against Qui-Gon Jinn on Tatooine and why he uses two blades against Qui-Gon Jinn and Obi-Wan Kenobi on Naboo. Therefore, the double-bladed lightsaber remains advantageous as a weapon allowing the face efficiently two opponents but is not overwhelming against a single target.