What do you mean by calculation?The heavy regex usage?

I think if you go back far enough, we have been pretty opinionated about the cookbook tree, e.g. files and templates have sub-directories for file-specificity. I thought we had decided not to allow subdirectories in one of the other segments because they'd make things too complicated, but I can't find the ticket right now. Looks like we were willing to allow subdirectories in some folders in [CHEF-672](https://tickets.opscode.com/browse/CHEF-672).