There is one great lie in the digital age, that you can fix anything in post-production.
I recently revisited an engagement session that I did last month with the intent of sending the client some high resolution versions of their top five images. Their wedding is next year, so I thought they might like some images to share with their friends that wouldn't worsen anyone's cataracts.
Personally, the images they chose were some of my favorites as well (and isn't it great when a couple and their photographer are in synch?) but they needed a little bit of punch up.
When people say that a picture is worth a thousand words, they are describing all of the little technical and artistic elements that make up an image. Part of that story is how your eye moves through a photograph and where it comes to rest. Normally, you want the eye to rest on your subject and not some incidental object that found its way into the frame in spite of your best efforts. Unless you're setting up a hunt and find photo for a live version of Where's Waldo, these intruders have to go make an okay image great.