OK. So if it's OK to load business logic into an object, why *not* roll in change tracking as well? Of course I understand the man-made rules about tiers and "thou shalt not"... but a self-contained object would be able to travel the world and function in a stateless app "as is". Where's the downside?
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1