It's fundamentally important in the balance of power between management and employees.
It's no secret that the right to associate, to unionize, is constitutionally protected in the Canadian Charter of Rights and Freedoms. The corollary to that is the right to collective bargaining.
Since 2015, the Supreme Court of Canada's decision in Saskatchewan Federation of Labour has confirmed that the balance of power hinges on the right to strike. If workers cannot exercise the right to strike, an equivalent mechanism is necessary to ensure the balance of power. Not having anti-scab legislation amounts somewhat to denying the existence of the whole process—the right to associate and to negotiate and the right to have the power to do so.
We have long had that in Quebec, and we don't see how it would be possible to ensure industrial peace and respect our charters and constitutional rights without anti-scab legislation. For us, in Quebec, not prohibiting the use of replacement workers under the labour code would be inconceivable.