It’s not that they just found out, but more that they have combed through and prepared all of the information they could legally release.

Unfathomably annoying, especially when it comes to modding games. The amount of times I’ve had mods or settings break because of some update that added useless content that I don’t want is honestly disgusting. For the most part, I’ve stopped buying games near their release date because I’d rather buy the game when it’s more feature-complete. The DLC scenario has become an issue in that it effectively translates to, “You will not get the game’s content in it’s entirety upon purchase”, which is unthinkable in other scenarios.

Imagine going to a restaurant and paying the price of a meal just to be seated. If you want appetizers like chips and salsa, it costs $9.99 per bowl. Drinks (including water) are $5.99. Both for the appetizers and for the meal, you pay the waiter first, sides are $2.50 extra. After purchase, they’ll give you an estimated wait time for your food, which may be delayed for any reason or cancelled altogether, even though you’ve already paid for it. The food comes out but it’s not what you ordered, the meat is undercooked, the portions are significantly smaller than advertised, or it’s actually a different dish altogether. You attempt to complain to the waiter, wanting to get the food you promised. The waiter tells you “Thanks for the feedback!” and leaves, never to be seen again. You hear grumblings from others around you that they’re having the same problems. What they ordered is not what they got, or something hasn’t been made properly. One guy waited all evening before they finally delivered enough food, piece-by-piece, to make up the meal he ordered. Eventually, after enough people have complained, the waiter comes back and gives everyone silverware. Nothing changes about anyone’s meals, but you now have silverware (even though you likely already had some before).
You leave the restaurant, annoyed, with less money, and still hungry. You later find a social media post from the restaurant’s cook complaining that their customers are self-entitled and are “expecting too much”.

TL;DR - Its like fast food, but without the “fast”.
… Or the “food”…