It's going to be a lot shorter path to getting going with direct drive and I can haul mine around at over 150IPM with 425oz steppers on my machine. I have not hit any mechanical limit just the software stepping limit on EMC at 8 microsteps. The 570 don't need reduction to cut or rapid so beyond the cleaner look and maybe less overall length I don't see the need. Aesthetics are part of it too though so if that's the way you want it looking and feel like spending the time, no reason not to.
CNC: Making incorrect parts and breaking stuff, faster and with greater precision.