Why don't we add ; at the end of if/else?

In Rust, I have noticed that everything is an expression except 2 kinds of statements. Every expression that adds ; will become a statement. Rust's grammar wants statements to follow other statements.

So why don't we add ; at the end of an if / else "expression"? This is also an expression, so why don't we do this:

if true {
    println!("true");
} else {
    println!("false");
};