Ah, the perils of allowing Google Translate to write your post for you. Digital files are nothing but 0's and 1's stored as electrical charges. You cannot "smudge" those, unless you are talking about Heisenbergean uncertainty, in which case the electrons are already "smudged" due to the unpredictability of their position.
The format that "smudges" and decays is the physical media you tout. One good scratch and a CD is toast, even when 98% of it is fine. Sure, digital files can become corrupt, but that's why you keep backups. I have two terabyte-sized USB drives that I alternate backups to, and I feel a lot safer with those than I would with a couple hundred CDs scattered about. Plus an external hard drive is a lot easier to put in a bank safe deposit box if you are really worried about a disaster at home costing you your files.
There is no rational reason to prefer the clutter-fostering option of boxed games over digital ones, apart from (questionable) aesthetics. Plus the physical product requires manufacturing, which adds to the expense of the product and its environmental impact. If you are so determined to have physical media, then copy your GOG games to disc and print out the manuals.