To me, the whole imaging and viewing process must become one to be truly successful. Some photographers never get into the darkroom or do the printing themselves. They capture the image and leave the rest to others.
I just cannot do that. I would feel like missing 50% of the creative process. So, it must be image capture plus image manipulation. But why stop there?
The mount, the mat and the frame highlight the print. They assure a proper 'environment' and eliminate surrounding 'noise'. That's part of the viewing experience. To me, it's part of the creative process. I want it to be part of my creative process. It cannot be left to others without potentially changing the appearance of the 'whole' print.
I can take this further (and often do):
1. What color and texture does the display wall have?
2. Is it hung alone or as a panel? What's the arrangement?
Some images work great on the right side of a panel but disturb the optical balance if shown on the left!
3. Is sufficient lighting used? Is it too bright? Is glare reduced?
Dim lighting makes for muddy images and dead shadows. Too much light is rare but it can kill midtones and highlights. Glare is a nuisance, and annoyed customers don't buy.
Over the top? Maybe, but I can tell you, points 1 to 3 can make the difference between a mediocre and a successful display. And if that's the case, mounting, matting and framing will make a huge difference!
Don't leave that to others, unless they can do it better than you can. If so, let them do it, but I would consider learning it is another step towards perfection.