I ride my Dakar very aggressively on tarmac and have never had any issues with the ABS. I usually apply braking force about 70/30 percent front/back and on the rare occasions that I have activated the rear ABS the bike still slows down fine.
I can understand you not wanting it if you ride a lot offroad with your buddies. Not many chances for me to ride dirt and I'm slow when I do...
2014 350 EXC-F
2006 Djebel 250XC