Disallowance has not be exercised since 1943 and before then its use was primarily to prevent provincial overreach into federal jurisdiction--a role that has been overtaken by the Courts and their judicial review power.

This would tear at the foundation of federalism.

Why are we seeing a still from Up Pompeii! on a post about I, Clavdivs??

That's a disgraceful slur on Oompa Loompas.