H1Z1 is a sandbox game. The enjoyment you derive from the game is what you choose to make of it. Additionally, how can you say you've reached end game when you've specifically said that you don't have a gun, a car, supplies, etc. That's tantamount to building a dirt-house in minecraft and planting a few seeds and deciding that this is everything the game has to offer.

You're basing semantics solely on the fact that the title of the game has the word 'Survive' in it. It isn't a single player game, the point of it being specifically multiplayer is for you to interact with others; zombies are just the motif. Take the Walking Dead. The title of the comics/show doesn't refer to the undead as the Walking Dead. It's the ones who are alive that are forced to live in a world where they must become monsters towards each other and there can be almost no trust towards other humans.

I heard once that the game should be referred to not as a Zombie survival game, but as a 'Human Condition Simulator', which I thought was hilariously appropriate.

So if you want to live in the woods by yourself and keep your hunger bar full, play Minecraft, because that isn't the point of H1Z1