The "it" being the Star Wars franchise. The specific "it" being the game, Armada, which is an extension of this franchise.
Being able to look at the table and know, immediately, which ships are Imperial and which are Rebel is part and parcel.
Fair point - however you know... they could make each side's Dreadnaughts look different. Either by paint or variation of mold. or both.
They've done it in X-Wing. 3 factions now, and several ships are shared between factions. Even TIE Fighters!