Mind you ABS is becoming so good these days that even on gravel it can far outperform non-ABS.
I have attended Simon Pavey's Offroad Skills course in Wales on a number of occasions. The first time was probably about 9 years ago using the relatively new at that time 1200GS. On the first day they said, "We've disabled the ABS and whatever you do, don't try and switch it back on!". In those days you had much more control modulating the brakes yourself.
Last time I did the course was about 2 years ago with the latest 1200GS with its various riding modes including Enduro mode. This time they said on the first day "We've put the bikes in Enduro mode with the ABS [b style=text-decoration:underline]ON[/b], and whatever you do, don't try and switch it off!". I must say it was amazing. Riding down steep, gravelly inclines with slippery roots in your path and the front brake on and the bike just rolled down the hill in a controlled safe manner. I was suitably impressed.
CS