Surely it means the opposite? Splitting into separate pools means they're only balanced within each other - not against each other. So buying the abilities to be a good melee fighter for example may not mean dumping your intelligence or social skills, because you're using different pools to buy different abilities relevant to different spheres of the game.Well, its main value to people who want it is that you control pretty precisely how a character comes out without too much constraints. Splitting into separate pools still means you're going to have to have a high value in one of those if you have a low one in another, and perhaps you'd rather have high value somewhere else, or have both of those high and something else low.
Or else what would be the point?