Like why wouldn't they understand such a simple variant when I could solve quadratic equations while I was in 1st grade?! Are they stupid?!
Battleground Chess

I think I can sum up the problems of this variant in one sentence: "Owwww, this makes my normalpersonbrain hurt."
In other words: INHUMANLY COMPLICATED; MAKE SIMPLER GAME, PEOPLE HAPPI.
in proper grammar: The game is overcomplicated by sheer number of pieces. The size of the board isn't a huge problem (XXL Chess exists after all) and the split between "land" and "sea" is a cool feature. The problem is that there are, no less than THIRTEEN KINDS OF PIECES! While fairy pieces are cool and all- I've enjoyed experimenting with them myself -it's not a great idea to put this many kinds of them into the game, especially when most of them seem to have been invented by you yourself. In short, main suggestion I have is: swap out most 'land' pieces with ones already in existence, ones made by Komeraidologists (people who've created fairy pieces, word of my invention)- Chess.com's fairy piece engine is a good start, as people will be more familiar with those- or already existing Chess pieces. You can also check Wikipedia's list, though some pieces there may be less well-known.
Is your brain smaller than a soybean?

INHUMANLY COMPLICATED; MAKE SIMPLER GAME, PEOPLE HAPPI.
It's not complicated, it's just a lot of information. That in itself is no reason to disqualify a game.
The amount of information involved in learning a large Shogi variant is much more. Large Shogi variants are not bad games.

The manual says, "The Guard has no class". Guards Union is offended for being misunderstood and denigrated.
Do they even understand that it's complicated because it's made by an Asian?!