Judging by the bolded portions of your post, you seem to have come to accept being screwed over and are therefore complacent with the current situation. As a result, there isn't much I can say to sway your opinion. I will, however, redirect you to
this video in which Jim Sterling exposes the "on-disc DLC is a necessary evil" nonsense for what it is in hopes that you'll get something from it and see things as they actually are rather than as they're explained to you by the very people who make a living scamming you.
He says that DLC isn't necessary and doesn't need to be there while gamers complain that they want a reason to keep the game and not sell it off after they are done with it.
"Make the greatest game the world has ever known and maybe I won't resell your game!" Everything gets old after a while. Doesn't matter if it's the greatest highest rated game ever made, a movie or a book. Eventually we all exhaust all it has to offer, get bored and move on. DLC is necessary as a quick and "cheap" way to keep fans interested in the same game longer, curb resale and bridge the gap to the sequel.
If it's content that's already made and just being held until a later date, it's specifically because of this. Many arcade fighting games would hold characters and unlock them one at a time over the course of a few months. This was done to keep players coming back and keep the game from getting old. That was the arcade's form of DLC and it worked.
The best part, it's completely optional. To this day the only DLC I have ever purchased is Red Dead Redemption Zombie thing, the Mass Effect series DLC, Peggle Nights for $2 and I bought the GTAIV DLC in disc form on sale and I have played A LOT of games this generation.
I don't really care for DLC personally, it's the same to me as micro transactions, but I understand why they exist. Nobody is screwing me over. You don't like the practice, don't buy it, I don't. Simple as that.