I think you're actually agreeing with me, but I may not have worded my post very well. The title update for Xbox 360 games had a limit. I'm not sure what it is, but I think it increased over time. Then when you go online, in the case of BF Bad Company 2, you would be required to download the compatibility pack (I think dice usually just called it a patch with a number). Some games called it other things. Essentially Dead Rising 3 is doing it as part of the title update now, rather than a separate download. I personally feel this is better because then you are set to go even if you don't get the dlc because it will just update overnight.
I can't really comment on installs, since I've gone all digital so I don't really now how that is. I also don't have a PS4 to compare to either.