If they had picked a number, it would have redefined the kilogram (or, indirectly, Planck's constant), breaking the SI unit system as it was then (and now) defi

If they had picked a number, it would have redefined the kilogram (or, indirectly, Planck's constant), breaking the SI unit system as it was then (and now) defined. Pull on one thread, and all the others may move. Also of note with this change -- the amu will unlock from Carbon-12.