It's all quite logical when put like that
Personally, I like to keep a large distance between configuration (which I don't mind losing), and data (which I do). I like to see config data as dot files, and real useful data as normal files/directories.
Now I understand how tidy the .kde hierarchy actually is, a simple move of 'apps' and '.Mail, and a couple of softlinks makes me very happy.
Thanks for your informative response.
Regards,
Steve Clarke