Yeah. I mentioned either earlier in this thread or another one of the caster threads floating around, that they need to write their official adventures with too much of things in them. Too many magic items. Too many casters. And so on. It's much easier for DMs to just yank out the extra casters and items to fit their game preferences, than it would be for a DM who likes more magic than the defaults provide to add in a bunch of items and casters. Doing it this way allows WotC to do the best they can for the widest number of playstyles.