The DualSense is a big departure from the DualShock and other PlayStation controller?s of the past. Sure, the basic form factor remains intact, but a few of the finer details are not present. Most notably, face buttons on the PlayStation 5 controller lack the classic pink, green, red, and blue colors. Why did Sony choose to break from tradition on this particular front" The decision apparently comes from an effort to simplify and unify.
Senior Art Director Yujin Morisawa noted as much in a recent interview with The Washington Post, adding that the face button colors aren?t technically necessary. Morisawa explained,

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