So, because I can't play a PS4 game on an XB1 that's DRM? If only GoG got as many games as Steam. Sadly, most publishers want to make their own store, or put their games on the EGS where there's always online DRM that bricks the game as soon as the servers go down.
What's the difference between pre-7th gen distribution models and today's distribution models? Most disks still come with 100% of the game on it. Sure there are day one patches, but in my experience those don't really change much about the game. Of course there are those certain types of games that are constantly being updated, and changed ala GaaS games. But I don't play those, and those games have always been like that even in 2004. They've just become more numerous and popular in the last few years.
Day one patch, activation patch, on-disc dlc, installation disc that barely has some data on it, and probably other reasons that I am forgetting right now. The thing is, the "complete" physical game is starting to become less prelevant by the day. That is something that wasnt really a case in 2004 when you bought 99% of games for your GC/PS2/Xbox or even PC, and all the content was there, instantly playable.
Vote the Mayor for Mayor!