My finances are my problem. All a landlord needs to know is that I am willing to pay what they are asking. It is my problem to actually pay the money. There are lifestyles in which you don’t have the ability to show someone a pay stub, and can still pay rent on time every month.
That is why things like credit checks exist. It’s a way to verify that a person has kept their finances in order and are responsible enough to pay their bills on time.