I am with you there. But unfortunately, many entities check credit to decide whether they want to rent you an apartment, whether they want to install pre-paid home internet to your house or hire you for a job in many instances.
So my argument is simple, if you want to check my credit to rent me an apartment, then the credit system should use my rent payment to increase my credit score, and this should apply to every bill I pay, be it prepaid or post paid.