I think that's even more so a problem these days for people getting into retro consoles because many of these discs are more than 30 years old, the disc drives too are getting up there in age. Many of them are starting to fail or become unreliable from dust and wearing out with age since the laser assembly is rather fragile.
It's one of the reasons why ODE and SD loader mods have become popular lately, as well as Homebrew game loaders on the newer consoles which can support them (PS2, PS3, Wii, Wii U).