"upgrading" from ddj-flx4 to ddj-400 or am i crazy?

am i crazy for thinking about switching to the 400 from my flx4? i realised all the features the flx4 has over the 400 i don't want to use, as they don't match the way i want to play – mobile devices, smart fader, colour fx, microphone – and honestly also prefer the older pioneerdj design language over the matte grey of alpha theta.

is there something significant i am missing about the switch? apart maybe from firmware updates?