I generally do what the customer wants. Some want them cut low, some don't. If a CM has been "murdered" in the past, then I will try to clean it up, but it also depends on how they've been pruned in the past and how they are growing now. I will always try to get down to an odd number (3/5/etc) of trunks and will clean up crossing limbs, those growing together, etc. I will be pruning up 2 more CM this morning and they have been planted too close to the house (< 5 ft), which is the case for too many CM, and that generally requires getting them to a place where their growth will not impact the roof. Just remember beauty is in the eye of the beholder, but many people do just what they think is right without any real clue to what is good for the plant!