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it's a big mystery...
In AD&D rules, I think the justification was that to change from say a fighter to a mage, a person would have to stop practicing their fighting skills, and apprentice themselves a mage. Since in BG2, you are gaining levels as a mage not from learning from another, higher level mage, but because your party is killing stuff, it doesn't make as much sense.
I think the real reason behind the rule in the first place was to impose some kind of penalty on dual-class characters. If they never lost their original class abilities, then there would be no drawbacks at all to dual-classing.
The 3rd edition rules about multi-classing have no such penalties, but they allow all races to multiclass.
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"Many are my names in many countries. Mithrandir among the Elves, Tharkun to the Dwarves; Olorin I was in my youth in the West that is forgotten, in the South Incanus, in the North Gandalf; to the East I go not"
--The Two Towers
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