Tee - it could be in the realms of folk-lore - it was certainly 'preached' a decade or more ago on the basis that A/B1 causes a relatively light 'drag' on the brakes which is more 'wearing' than a considered and measured positive manual braking effort. I have no reference for it other than vestigial memory of Ops Manuals 'of old' as I assume ant 1 and Centaurus have. Things often 'disappear' from FCOMs and the like for many reasons including liability issues.
There is nothing wrong with using A/B1 to assure early braking application but I recall it was thought to be the retention of A/B1 down to lowish speeds with the A/B modulating with reverse thrust that caused the increased (and unnecessary) wear and regrettably many companies made A/B1 the 'automatic and thoughtless' minimum 'norm' for all landings when often it was not needed.