Well, Positional Chess Right? making sure your peices have activity and you are progressing towards a tangeable advantage. THOSE are the things you need to obsess on in CC. if you Don't obsess on them and fall into somekind of tactical disadvantage; your opponent definitely has the time to work out your demise.
So in the end, Chess correspondance is about the Thought process and about making a bad thought process better; by REALLY taking time to study out the moves.