Ok, so lets go over this logically

You get the game a month ago. In numerous areas of the websites you are told that you have to complete the MSQ (Main Story Questline) make sure to read the bracketed words carefully OP.

You then proceed to do the MSQ and while you still are being given MSQ quests you are then shocked to learn you would have to complete all of them to advance to the next part of the story. Which you had to do to advance the whole time while leveling up.

Do you see where your logic is flawed? Even if the website didn't post it, common sense would have told you as you expierenced and learned how the game operated by leveling up.

You also do realize that this particular MMO is very lore/story based. So yes you are expected to go through it all, and not just jump over certain parts.