Optimizing for what you think YC partners want is a sure way to not get into YC. You're not a mind reader; what you think they want is almost certainly different from what they actually want. More importantly, they read thousands of applications, and you're only working on one. They can smell people who are trying to game them from a thousand miles away.
Just doing what you do is the only thing that matters and will get you in, assuming you're doing the right thing. (Asking alums for feedback on the application is a very good way to make sure you're doing the right thing and your presentation doesn't suck)
Your theory seems to apply to SEO as well (just make the best content, and google will rank it highest for relevant terms), and yet the whole SEO industry exists, and most of journalism has changed the way it uses language so that it is more parsable by googlebot -- Google Standard English.
Just doing what you do is the only thing that matters and will get you in, assuming you're doing the right thing. (Asking alums for feedback on the application is a very good way to make sure you're doing the right thing and your presentation doesn't suck)