The status of each province as far as relaxing COVID measures is mostly up to the provinces, and that holds true in Ontario, as well. The exceptions would be things that are under the jurisdiction of the federal government like borders, travel, transportation, federal employees, etc. At this point, the reasons for restrictions and relaxing of restrictions depend on provincial governments and are largely political. I can speak best to Ontario's situation, but we have a Conservative premier who has generally waited way too long at the start of each wave to impose restrictions, and then he finally caves to public pressure and criticism and does impose them, but it seems that when it comes to reopening, he takes a more cautious approach. Some of that is due to healthcare capacity and healthcare worker burnout, among other things. Ontario is unique in Canada in that the south - southwest portion of the province is very densely populated, and without restrictions - or, by loosening them too rapidly - it would spread like wildfire and undo any good that the restrictions were intended to do in the first place. Anyway, the point being, the provincial governments have far more scope when it comes to imposing restrictions that impact our daily lives than the federal government does.