Why is D&D still Medieval?

[Duiker]

BUT the setting lags way, way, way behind. A character can be covered with lightning and force effect spam......but in the setting it is still 'strike two rocks together to make a fire to cook for dinner'. A character can teleport around, but still have to walk 100 miles to the next city.

Are you saying that D&D prohibits campfires that aren't made by two rocks being struck? Or are you saying that it's weird that there aren't any firestarter kits from REI in the item lists? Because you could throw those on there for 1gp or whatever.

Is there a requirement to walk 100 miles somewhere? Or are we imagining a setting where everyone has easy access to 7th level conjuration spells? Like... if you have Teleport, then Teleport. What's stopping you, exactly?

I'm really baffled as to what kinds of setting upgrades you're expecting.