I strongly disagree with your comment. Your definition of luxury is narrow and proscriptive. If you're trying to evaluate whether people would accept certain changes in their lifestyle, their definition of luxury is the one that matters.
In a tight definition, indoor plumbing is a luxury. As a person whose family vacations used to include an outhouse, I most certainly do not consider that a luxury in my life.
In a tight definition, indoor plumbing is a luxury. As a person whose family vacations used to include an outhouse, I most certainly do not consider that a luxury in my life.