Bandit LOAF
Long Live the Confederation!
The Sabre was probably stretching the hardware of WC2 era, but WC3 was running on more powerful computers --or not running at all. Also, the Thunderbolt and the Kilrathi asteroid ship probably put the same strain on the engine. Granted, the other Confed and Kilrathi ships are made of straight lines.
The original Wing Commander I engine was special because it displayed ships as a collection of individual, pre-rendered sprites instead of as 3D meshes. That let the artists display ships that seemed impossible in 1990… because instead of having the game creating them on the fly, it was choosing from a collection of images and then adjusting that image to your view. Origin could render those images on high end hardware (which might take hours or days at the time) and it was all set–like baking a cake instead of shipping a box of ingredients. So at a time when games struggled to render simple wireframe shapes, Wing Commander I looked impossibly good.
Wing Commander III's engine works more like most any modern game: it renders a multi-faceted mesh of shapes and then attaches a stored texture over them to add details. Origin premiered this system with Strike Commander and their artists were the ones that taught the industry how to do it (courtesy of the late, great Paul Steed). What this method meant was that you could render a relatively simple shape (say a set of rectangles) and then use textures to up the detail and make it look like an F-16.
The claim for years was that the shift in art style in Wing Commander III 'must' have been because of the shift between these two systems. But that's just not the case: Origin's artists could do an excellent 'rond' ship in the engine (the Arrow has more curves than a Sabre!). Wing Commander III avoids that style of ship because it had a dedicated art style and not because it was impossible… look at the Wraith, a totally round ship that effortlessly makes the jump from prerendered sprite in Academy to realspace object in Armada. The only reason it's not in WC3 is because Chris Roberts didn't want it there.

