"Wealth isn't "stuff", its the social relationship of command."
Oh fuck thats an amazing point.
The medieval king did not have aspirin.
He also did not have to wait six weeks for an appointment with a doctor who told him to lose weight and the pain will go away.
The medieval king did not have a car, or even a bicycle.
He also did not have to travel an hour and a half every morning and back every evening to work so he could keep a roof over his head.
The medieval king did not have internet access.
He also did not have to give his personal information to companies that treat it carelessly (how many major data breaches have there been in the last few years? How many of those companies have gone bankrupt or had people go to jail over that?), in order to remain connected to a network of potential job opportunities.
It's not about "what modern things do you have that didn't exist 500 years ago?" It's "how much of your life is free to live as you wish, without worry, without threats, without someone else having the ability to make you miserable just by refusing to acknowledge your existence?"