"No antibiotics" - true "Modern sanitation" - only really necessary in cities. But 90% of populace lived in the countryside. My grandparents did just fine without any kind of modern sanitation. "Internet" - true, but also irrelevant for quality of life. "refrigeration" - completely unnecessary when you have fresh food. "central heating" - completely unnecessary as medieval houses weren't massive and could be heated just fine with a fireplace "not much education" - true... to an extent. "massive infant mortality" - true, but if you didn't survive infancy, you wouldn't worry about living in Middle Ages, would you? "no way to travel faster to a horse" - so not having something completely useless is relevant for quality of life?

All and all, your objections a) completely miss the point and b) are kinda weird.