If you ever plan on driving your NSX in wet conditions or live in a place where it can rain on you while you're out driving (like South Florida), I highly recommend keeping the ABS. I'm the last generation that learned to "pump the brakes" while skidding in the snow. I learned to race without ABS and eventually transitioned the technique of braking into the ABS for the corners as the technology made it into modern cars, though I don't push that hard on the NSX anymore. On the NSX, the ABS system buys you a few extra seconds of steering input that can mean the difference between a bad shunt or a close call. The newer system (OEM or AP1) is vastly better than the original system and much less intrusive. If you live in a place like Arizona where rain isn't a factor, I think deleting is fine. The brakes work exactly the same as they would with an ABS system (except when sliding, obviously)
JMO