Oh, we must disdain crossbows for having scope mounting capability! But wait... What? You can put them on conventional bows too? Even RECURVES??
Stiennen Telescopic Bowsight 1963
Some define 'traditional' as anything predating compounds in the late 60's. By some definitions, mounting a telescopic sight on a bow is traditional. We've still got scope mounts using long eye relief scopes for bows today. Some who visit this forum use them and still others swear by using red dots on their bows. So I have to say that's an argument rendered moot.
edit:
Rereading, my sarcastic humor looks a little overboard. Shoulda put in a ton of smilies.
Just pointing out one reason why the scope issue hadn't been brought up. It's one of those things that can't be griped about with crossbows that can't apply just as equally to compounds. Even though scope users are a small minority, the capability is there. Just as the capability is there to use a crossbow with peeps and pins, or even no sights at all.