That's stupid. Real MMOs have it in a form, eg some classes can't use clubs, but destiny is an fps first. And each exotic brings something unique to the table.
I say, allow ace of spades, tlaloc, and whatever auto is titan specific to be used by other classes, but the quest can only be received by the corresponding class.
I guess this all comes down to- do you want classes to have distinction, or individuals themselves?
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Have to self bump? Lol sad. Class exclusive guns are good. It allows each class to have that one special thing that sets them apart that no other can get. If you don't have all 3 classes, then sucks for you. Should have thought about that ahead of time, who needs multiples of the same class anyway?