
I would think that a heavy difference between the two is that steam has always been a digital platform, while Sony usually always published their games as physical copies as well as the digital copies. Along with such, steam relies heavily based upon the power of the computer, while console games are built around the console itself. And there’s also the issue that not everyone has the stable internet connection at home to always be downloading all of their games, and that a physical copy helps.
People who are less fortunate still be able to enjoy a lot of big titles, especially those who purchase most of their games second hand like I do. I rarely ever have the opportunity to purchase a new copy of anything and physical copies allow an amazing opportunity for people to be able to enjoy a game without spending the full 60-90 bucks for the game, when someone else decided they didn’t want their copy anymore.