That's exactly it, because you can't have the same impact.
As MPs, first and foremost we represent our constituents. So we have to listen to them and carry their message. If we stay in the bubble of our constituency, we won't get the opportunity to discuss our issues with our colleagues in Parliament and, based on comments from the people, find a way to introduce more meaningful bills that lead to laws better representing what we see on the ground that will help the people.