Traditionally, isn't the crossbow open to more classes than the bow?
Sort of.
In AD&D, the classes that could use a bow: Fighter, Paladin, Ranger, Assassin.
In AD&D, the classes that could use a crossbow: Fighter, Paladin, Ranger, Assassin, Monk.
Clerics were limited to a throwing hammer for their ranged weapons.
Druids had daggers, darts and slings.
Magic-users had daggers and darts, as did Illusionists
Thieves had dagger, darts and slings.
Monks had crossbow, dagger, hand axe and javelin.
It took a few years before it loosened up. (I think Unearthed Arcana allowed the thieves to use hand crossbows...)
Cheers!