Sorry, but your English isn’t on a level where it can be properly understood. I really don’t have any idea what you said in a few places.
Anyway, to summarize:
According to your definition of map advantage, and how much significance you claim it carries, it should therefore be nigh impossible for Horde to ever cross mid since past mid there are a lot of Alliance NPCs & elites, and Alliance have a closer graveyard.
According to your definition, the only chance Horde would have would be to secure SF GY first before moving up.
Yet because the “PvP ability” tends to be so skewed towards only one side, this is almost never the case. Horde can almost always just rush up past mid and ignore disadvantages, because the Alliance aren’t putting up enough of a fight to begin with.
Thus, PvP is what decides the BG. And this is not something new. It has always been like this ever since the premade exploits got shut down. Which can be explained with: