Well, if they did it just to be "old school" I don't think it would translate very well as Div:Dos is not based on an AD&D rule set whereas the game mechanics of Baldur's gate was built specifically around the AD&D 2nd edition rule set.
From the gameplay I have seen so far, the encounters look like they can get pretty tough so without a rhyme or reason, expanding your characters skills at a snail's pace could be quite a bit unbalancing, plus it's always nice to feel like you have advanced your char (other than gear) a bit regularly.
