Wouldn't a presidential-parliamentary system be more effective?
No, the rule of the President is to sign bills into law. He/She must be objective at all time.
If it was a presidential-parliamentary system like America/France it would become a mess.
How about each of the 16 voivosdhisp having 3 senators
No, why should sh!teholes infested with rednecks like Podkarpackie have the same say in Parliament as better, more forward thinking provinces?
No way. Representation should be done per population.
The problem with Polish politics isn't the structure on which it operates, it's the idiots operating it.
Would you blame they JCB that dug the foundation of your house?
No, you'd, rightfully, blame the clown who was behind the wheel.