I often see a benefit of riding rollers is increasing your "balance".
If you can already ride a bike on the road without falling over.... what is the theory that you can "increase" your ability to balance? You either fall over, or you don't.
I've fallen a few times in 40+ years of riding. None of the falls were related to balance. They usually were related to coming in contact with things that were not moving.
I ride rollers and a resistance trainer in the winter. Rollers only seem useful as a distraction from riding the trainer. It seems to me, the trainer is good for anything rollers can do, but the opposite is definitely not true.
Do you feel there is any truth/value to the "balance" thing, or is it just something that keeps getting repeated?