@brian - I definitely think that the use of factories helps reduce
coupling when your swapping objects (User to RegisteredUser) but once
you introduce another subtype or choice, some level of refactoring is
required if you want to replace an existing call to obtain a different
object. For example:
user = getFactory().getInstance("user");
to
user = getFactory().getInstance("differentUser");
or
user = getDifferentUserFactory().getInstance("user");
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