Level limits are for 2 groups of devloeprs. One are those who wanted to focus on a more controlled power span and make it be qualityand the other being weak ass developers who suck at balancing and so shouldn't be making games.
KOTOR is the latter, and NWN was the former.
Also, this idea that having 30 levels will make the game easier is bollox. It's so full of crap. Then again, anyone who has played both HOTU and KOTOR know which one was ahrder and it was the one with higher levels. Go figure.
In conclusion, once again Hades, your logic sucks.