question about H1Z1: Just Survive (Just Survive)

guys who are able to explain what this means ?? before this game was like all the others (razd day, etc.) now they divide it into 2 parts. 1st is actually Just Survive which, if I understood everything correctly from the description, did not undergo any changes at all. the same game as in the 15th year, collect the rushes and build up and kill everyone around the living ... tobish WPVP. soon they are planning to release another branch, I understand that there will be the same WPVP but in a closed space without an open world or what ?? I do not understand all the dances with tambourines, was it not easier in the game itself to simply allocate territory for this and not make a separate branch of the game? Yes, and why do we do this at all, there are no servers.