Most of the code I've seen with this construct in new does not have the usage you describe as a justification. And I don't find your justification compelling where it does apply.

I would prefer to write (ref $obj)->new instead of $obj->new because that tells the reader that the type of $obj is variable or questionable. If I write Obj->new there is no doubt of the type. There is less chance the reader will research the wrong package if he wants to do something with the created object.
If I just write $obj->new as a convenient shorthand I hide this info. Thus I make the code more complicated to understand.

In reply to (Re:) $class = ref $class || $class by rir
in thread Constructor/Factory Orthodoxy by mojotoad

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