Absolutely, Parliament has the prerogative to direct how the legislation should be promoted and drafted.
But also, I don't believe Parliament wants to create any uncertainty in the law, especially where the law is clear where acts apply. There would be a period of uncertainty, I believe, if this type of approach were taken. I'm not saying that it won't be taken in the future and can't be taken; I'm just passing on a concern of what the effect of it might be.