By "all modern people", you apparently mean the relatively small group of middle-class professionals who can earn a decent salary on a shorter working week, and

By "all modern people", you apparently mean the relatively small group of middle-class professionals who can earn a decent salary on a shorter working week, and are in a position to negotiate it. There is a far larger group of people working in low-skilled jobs whose entire salary is not enough to cover their outgoings, and must also rely on consumer debt and government assistance to support themselves and their families (think Walmart workers on foodstamps). What's more, the balance of power with their employer is such that they have absolutely no leverage to negotiate shorter working hours, even if they wanted to. A low-skilled worker is expected to be at the beck and call of their employer up to, and often beyond, the legal limit of work. When you can be fired from a job you've held for years for being 30 seconds late, you're not going to get far asking to work two less days a week. It's nice that you were able to arrange an easier lifestyle for yourself, but don't mistake your privileged situation for the norm.