Because the rules of the chambers are not designed to be neutral, they're designed to advance the goals of whoever has written them. In the House, it's leadership. In the Senate, it's to protect the powers of each individual senator.
The House Rules change every 2 years. In the Senate, changing the rules takes 2/3s, and that basically never happens.
The House Rules change every 2 years. In the Senate, changing the rules takes 2/3s, and that basically never happens.