They also make for easier customization at a fraction of the price, if you screw it up.
Like the new Commander class Shockwave, who has 2 flaws that you can live with but I felt like modding. 1) his head wasn't able to move, 2) his arm cannon was lacking an underside.
Honestly I just pile them all into the same contunity and have the different aesthetics be different sub groups of the Transformers race. Then take the best of each Optimus Prime etc as the current look.