I guess it's easier to resort to ad hominem instead of explaining why a game client would need to render anything that is outside it's field of view and thus negating completely the effect of the size of the map of the equation.
The only thing I said about rendering anything outside the view was to define what you said (i.e. clipping). I do not know any game client which renders anything that is not on the screen. Like I said before, that was all flushed out over 20 years ago. Why am I using 20 years? Well, I happen to have completed a game engine exactly 20 years ago this month and it did clipping, culling, mipmapping. All those things you think are the domain for 'more developed game engines', which is just nonsense. The first thing any 3D graphic coder/designer learns is, "The fastest triangle you will draw, is the one you do not need to draw."
If War Thunder etc. can produce stunning visuals and they have a similar view distance and field of view compared to AH, how would map size take effect (to graphics) if we forget the added load of tracking larger amount of objects in virtual space?
WT does not have near the same view distance, nor the same default field of view, and we do track an unlimited number of objects. All those things impact performance. Visuals are more about artwork than anything else. They have 9GB of data, we currently have far less than 500MB.
Does WT look better than the current Aces High release? Yep, it sure does.
You can compare the situation like if you were playing nethack. You stumble through a vast dungeon and you have a lantern as your light source (field of view). Even though the dungeon is huge, you only see the are that your lantern can light up at any time. The single game client is like a character in the night with it's lantern, a bubble of 'light' in the dark.
Why is my analogy wrong, please I would really like to know.
It is based on assumptions which have no basis in reality. Nothing you have said has been constructive. Each time I have pointed out a correction you have countered with misdirection and defensive posturing. Or you have simply resorted to making outlandish statements, which have no basis in reality.
By the way, people who are simply 'curious' about topics, ask questions. They do not make definitive statements about topics they have limited knowledge of.