Here's my take on ABS.
ABS on the rear brake would be a good thing for most riders most of the time.
A rear wheel lock up is far more controllable than a front - good to have ABS on both wheels for most riders most of the time.
The "better" ABS works under slippery conditions, the worse it will work under dry conditions, assuming a rider who can competently apply the bike's brakes to maximum. In other words, what safety margin you gain for slippery conditions, you trade off longer stopping distances in when traction is good; most riding is done in under near optimum traction circumstances.
I'm afraid that this is ABS (All Bull Shit). A good ABS bike will stop just as quick as a non-ABS bike in all
conditions but will stop quicker and more safely under the rider's control in situations where the wheels lose grip. As for "most riding is done in under near optimum traction circumstances" that probably applies in sunny California where motorcycling is more a recreational activity but in other parts of the world, people use their bikes for daily commuting in all weather conditions.
ABS is not going to be a factor, pro or con, in the overwhelming majority of motorcycle accidents any more than it has been for automobiles. In motorcycle single vehicle accidents, rider error (excluding poor braking) is the most frequent cause. In multi-vehicle accidents, the error is most likely on the part of an auto driver.
It usually isn't since the purpose of ABS is to avoid getting into an accident situation. I agree that rider error (or rider over-confidence) is a major cause of accidents but wouldn't you classify the failure to notice a loose surface, ice or oil on the road as rider error - conditions that ABS can handle?