The pass bills, they debate and changes laws but to what extent is it effective.
The parliament makes laws in future. Which means they think ahead of what the world’s developing to and thinks of what new laws will be needed for society once this is done it allows society to know what the law is and how it will apply to them.
Another thing that parliament is the debate that takes place in parliament. The members of parliament can point out the advantaged of a particular change in the law, as well as flaws in any proposed change in the law.
This way the views of more selection of the public can be considered.
The parliament cannot always foresee future