The issue with this stance is that rationality shouldn't be reduced to "logic" and efficiency. When it is, then bad things happen.

Another issue with EA is that it is yet another trendy thing among nerds and techbros that was iterated hundreds of times in philosophy under general debate on consequencialism/utilitarism. Of course nerds and techbros think of themselves as smarter than everyone else, so they don't bother engaging with that debate in honest manner.