In a word: Money.
Raving fangirls who buy all the shit merch and line the publishers and authors pockets would much rather read about some em0 guy and his equally em0 brother's bitchfest fight.
They call it shounen, really it's just for yaoi fangirls to get their fantasies off with. Cool and interesting characters get in the way of that by limiting the extent of their imagination. (Which is small enough as it is.)
Now that the unpleasantness is out of the way, THIS IS AN ANKO THREAD!