Are you complaining that with practice you can beat a game? What do you think they should add? Left4dead monsters that upon gaining line of sight of you immediately kill you?
If the game is not hard enough for you, open up the sandbox and set the difficulty yourself. Hell, even use a mod that makes zombies run as fast as cars if it is still too easy for your greatness.
For the rest of us, we're happy to get this content. The first thing that comes to mind when I saw this was. "Wow, we could do a map that is 100% forest with no buildings and make civilization." Not. "People might live in the forest and that might be easy- Because living in the forest is already easy and can already be done.
Your just beating a drum complaining about content being added, while claiming no one else can understand your vision. Meanwhile plenty of people have 4k+ hours spent on the game and are much more excited about this content than fighting zombies while pressing the back button for the ten thousandth hundred time.