The TLDR is that most people, especially car drivers will tend to slam the brakes in an emergency and especially the rear because driving + foot pedals. You can out brake ABS quite easily on a bike without ABS by using a lot more front brake and being willing to lift the rear wheel. ABS will prioritise keeping the tyres on the ground and from sliding at the expense of stopping distance. You can stop in roughly the same distance with ABS as without if you use the brakes progressively rather than slamming them.
All that is caveated by saying this is only in a straight line, as soon as you add some corners or twisting evasive moves, ABS wins.
Learning to brake to the limit is an acquired skill. You've got to practice a lot before you'll be comfortable going to full brake, with the rear dancing around. ABS is incredibly clever as it reads real road conditions far quicker than we can. Bumps, patches of damp / gravel / oil etc.
This is a good video on this topic:
https://youtu.be/sDbWZiaUeDY?si=cFhkZ4Qia8HZ8Xu3
The TLDR is that most people, especially car drivers will tend to slam the brakes in an emergency and especially the rear because driving + foot pedals. You can out brake ABS quite easily on a bike without ABS by using a lot more front brake and being willing to lift the rear wheel. ABS will prioritise keeping the tyres on the ground and from sliding at the expense of stopping distance. You can stop in roughly the same distance with ABS as without if you use the brakes progressively rather than slamming them.
All that is caveated by saying this is only in a straight line, as soon as you add some corners or twisting evasive moves, ABS wins.