The DLC that is being sold for $2 and $3 is not core to the game itself. It's extra, so that above picture is incorrect. You don't need to buy it, nor is anyone putting a gun to your head forcing you to do so.
Would I love it for free? Absolutely, however the world doesn't work that way and video games are expensive to produce. But the game is not incomplete just because they're selling some CAS parts and music which most people wanted as DLC to begin with, plus there's plenty of other games with on-disk DLC.
And the preorder bonuses are there to get people to buy the game new instead of used which the publisher doesn't make any money from. I wish things were different, but that's the nature of today's video game market. Deal with it.