I'm not worried about this "day 1" patch that they will be making post gold status, I'm really worry how are they going to communicate this to the general public after giving their reason for the delay.
They've communicated the reason for the delay. We all saw it. That 53 minute demo. That was not acceptable to put on all of the discs. Imagine it's 5 years from now and you're stuck at someone's lakehouse with no internet, but there's a PS4, and you want to replay that timeless masterpiece known as FFXV. You pop in your hard copy of FFXV and THAT is what you get. And from what they've said, it gets far worse later on.
So, the delay is there to make that base version actually playable. Continued support/optimization will absolutely lead to a day 1 patch as well. But, instead of the disc just being a key to a digital download, it will also be playable straight of the disc.
Now, to your point, half of the internet will have a meltdown and a bunch of trolls will think they've had their moment when they tell the world there's a day 1 patch, but, half the internet is dumb.