Okay but NES games are still playable and transferrable. Even earlier games for the first gen consoles like the MagnaVox Odyssey are still playable, and those are far older than one decade. And if it suffers physical damage, even to the point of becoming inoperable, as long as you dumped the ROM of your game you can continue to play it (at least in the US).

If a ditigal game shop server goes away, you better hope you downloaded your data, and that the hard drive you downloaded the data to never becomes inoperable. Because once that happens, it is gone forever. Even if you technically legally still have the license still to play it, if you tried to bring a legal case about being unable to access a game you paid for, the game publisher can just invoke their right as granted to them by the EULA of the game license you are forced to agree to to use their software (shrinkwrap license) to "revoke your license at any time, for any reason."

Much, much harder to do that when someone owns a physical copy of a game, as that would require forcibly removing the physical game from you (AKA theft).