Those kings lacked modern luxuries, to be sure. They even lacked most modern comforts. Those kings of the past did not have to worry about being homeless and were unlikely to worry about putting food on the table. When it comes to the essentials, their needs were met and (for the most part) they did not have to concern themselves with losing it due to their economic position. While they may be concerned with losing those essentials due to the politics of the era, that is something entirely different.
Edit: for clarity.
This isn’t a dinner party conversation of whether I’d rather be a feudal lord in 1270 Britain or an American living paycheck to paycheck in 2020.
Or they might be downvoted because this community skews towards makers, and “it’s better than it was so why talk about how to fix its problems?” is the antithesis of building, creating, making. It is the antithesis of the very real work of progress.