Two power sources take a lot more engineering and a many more points of failure It sounds good but it does mean more and unnecessary expense. Ice cars are very reliable and would be even more so without massive list of Government regulations from bumper to bumper.
ICE cars are freedom machines. All others are restrictions on personal liberty to varying degrees. Rational, freedom loving people drive ICE vehicles.
I agree that hauling around all that weight of an ICE, electric motors, a heavier power transmission and distribution system, and batteries doesn’t seem to make much sense on paper.
But if we have to appease the insane green zealots and government kooks, then hybrid make a lot more sense that all EV. It’s a compromise with the tyrannical dictators.
I really didn’t think the Toyota hybrid drivetrain would pan out when it was first introduced for the reasons you listed. But it’s been a huge success.