I think they do it to encourage you to try out the other classes. A lot of people are guilty (including myself) to only playing as one class right now. It's best to use all three so having an exotic already waiting for use on that character would actually be pretty nice.
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Again that's Bungie forcing their opinions on us. First they didn't FEEL we need to talk, then we should have lots of no life friends to raid with. Now we are supposed to want to play multiple toons. I played the same toon in WoW for like a year because that's what I liked