I have some more thoughts about this topic. Not only do modern games lack manuals and inserts to make them lighter and cheaper, but they are also made in China, Mexico, Thailand, Indonesia, or somewhere that has cheap labor to manufacture them. The same goes for game consoles, TVs, and other electronics. If it says, Sony or Toshiba, it's not really made in Japan. It's made in China.
If you look at retro games for NES or SNES, they are all Made in Japan, including their respective consoles. I don't have to say much about Microsoft. It's already made in China, Indonesia, or Mexico by default, even the discs. lol.
If you watch the Pawn Stars and American Pickers, products that were made back in the day were very high quality. It would probably last 100 - 200 years no problem. And everything were made in America or Japan, you know, within their respective countries. But the things we get today are so flimsy, cheap, and thin looking. I'd be surprised if they last 5 years. Hehe. I ask you, "So 20 years from now, will there be any classic antiques left in the world with the junk we're making to have an American Pickers or Pawn Stars show? Or will real Pawn and Thrift Shops just throw everything away and go out of business?"
For example, let's say in the future you sell a "rare" RPG game that came out in 2014 on Ebay. You say in the description that it is complete and in good condition. With retro to semi-retro games, you have manuals, inserts, posters, maps, etc. It would look awesome in the Ebay picture spread out like that. But with a modern game, all you have is a cheap case with a disc. *Crickets chirping* Certainly, collectors like me would pay much less, since it's not really a "collector's item." To me and I'm sure many game collectors out there would agree that all those physical objects in a game box adds a ton of value to the whole package deal.