Well, we can parse words but royalty and wealth, especially in those times came with considerable privilege. Who needs indoor plumbing when your serfs can deliver anything you need, from water in to sewage out. No need to go to a store or build anything as the best of the land was yours for the demanding + the best artisans were at your command. Heat was the servants' problem, not royalties, they merely had to direct them to throw more wood on the fire. Cooling during summers in Europe at the time wasn't critical. You mention leisure time but it was available in great abundance from birth to death for royalty and wealthy of ages past. Today such "off" time is measured in weekends and a few weeks of vacation time with 40 hour work weeks. In olden days, the royalty only worked at what and when they wished to. Unless you consider their hobbies a career, they never needed vacations or retirement. I do grant your point about disease, which was the great leveler, then more so than now.