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If you want to stop players becoming powerful in every class make is so in order to get to the top of a class you have to devote so much experience and practice to gaining the most powerful abilities you cannot develop them all during the course of the game. Also if the player does not practice a skill for a long time it goes down over time, e.g. a fighter that spends 90% of his time studding a spell book is going to start to loose his combat abilities. So the player has a choose be a jack of all trades, or be a master of one class.
When it comes to the combat system, it all depends on how much detail you want to put in. BG uses a simplified version of AD&D, it covers non of the more complex side of the rules, like charging, firing into combat, and attacks of opportunity. In the end it comes down to how many details do you want to take into acount.
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