Correct. It's because not everyone uses every mod in the list. For example. If the configs were setup to have Thermal Expansion (COFH) manage all the ore, someone who installed a lot of these mods and not include Thermal Expansion (COFH) they would have a world with no ores. Which is bad. So, we try to let people do that themselves. We can give some limited support on how to do this, but it's best to leave it up to you.
The goal of the config pack is to solve ID related issues. The actual configuration of the mods and how you want to play is up to you.