The depreciation is irrelevant because value in any economy is entirely dependent on human belief. If you don't believe it is valuable, then it isn't. A brand new diamond necklace can be worthless before you even buy it if people stop valuing diamonds and jewelry. Things get old, we value most of them less, depreciation is automatic and unavoidable.
Societies, such as this one and all others, happen organically NO MATTER what those who think they know better imagine. You can't have Hitler, or Churchill, without societies to give them definition, meaning, and their (temporary and conditional) cooperation. If the people don't cotton to something, there's nothing you can do to get them to in the genuine way you want. Life is truly what happens while we make other plans.
We don't have a three day week and products you think would be more durable because the rest of your species doesn't see a need for them. And given that the system they have evolved is keeping the lion's share of them employed or at least not starving, they're probably right. You want a three day week? You need far more functional robots and manufacturing that can be done at present, and certainly more than we can presently afford at current start-up costs, and you'd immediately reduce the labor done by people, hence the pay they received. All you'd do is cut the workers' paychecks by two days and an equivalent amount to their benefits including health and retirement.
And no, people could not buy robots and then rent them to businesses because the business has a superior economic position for robot purchase and can simply buy an entire factory full and fire all the fleshies. Now you have a zero workday week, and you have no income and thus no housing or food, and you can't buy the nifty products the robots make. But, that being so, the businesses have no one to sell anything to, because no one has money. Therefore, we all have to live with each other as we are until we evolve something better that doesn't just whiplash us into the decline of modern civilization.