I don't think they're ignoring it. They're just not pushing it as much as SoA.
Also, personally I don't mind the Boom designs that much anymore as long the designs are not permanent. Amy, Shadow, and Tails looks pretty much the same. Sonic is okay (it looks better then what we would've had if they used one of the earlier designs). It looks almost like his modern self but with blue arms, a brown scarf and sports tape. Eggman has the best design, and Knuckles has the most drastic design out of all the characters.