Agreed, and a similar point can be made regarding private zoos (first world citizens have access to zoos) and milk baths (most of us could afford it but we have

Agreed, and a similar point can be made regarding private zoos (first world citizens have access to zoos) and milk baths (most of us could afford it but we have even better hygiene products). Some past luxuries were just fads and go out of fashion, others address a lasting need but fail to scale up and remain extravagant luxuries only available to the ultra rich, others still also address a lasting need and are transformed into something that works on a societal level.