Another unpleasant abnormality I regularly see is, in an otherwise healthy and beautifully shaped shrub, there is left a tree sapling or ugly weed left to grow right in the middle. It doesn’t take a rocket scientist to understand that it shouldn’t be there. If you whack it off it will no doubt return with a vengeance so completely remove it while still young and easy to tackle.
When planting your landscape consider “boning-up” on what each specimen is supposed to look like when having reached its mature size and shape. Take into consideration the natural flow of the specimen. In other words, don’t try to make it into something other than what it was meant to become other than a normal trim job.
Yes, there are exceptions like espaliered shaping and if trying to form a box-like design like Das Dutchmen Essenhaus’s name in their shrubbery (this particular type of yew actually benefits from shearing forming a “tight” and dense shrub) but for the most part species should retain their natural form with minimal shaping to control a natural flow.
OK, I’ll get off my soap-box now, but the message remains: don’t let ugly ruin an otherwise perfect home and landscape — remove, replace and restore.