If you are from out of province, but have Canadian medical insurance in another province you'll get emergency care covered, but not follow up care like rehab and not a $$$ medical flight back home. So someone from ON gets stuck in BC because they are too sick for commercial air flights, but can't afford a medical flight home and can't get rehab in BC. Often they are without family support because those folks can't simply stop working, travel across the country and stay in a hotel in BC for an extended time. It can be a real nightmare.
If you have travel insurance that usually covers medical flights back home at which point you'll get rehab/follow on services and your family can support you. Canadians are usually thinking about travel insurance for heading to the US, but not for travel within Canada.