The whole system is designed for people having stuff "they only sometimes need".
That is the result of technology which has massively reduced the cost to produce items. Once the cost to purchase and store the item becomes less than the cost to rent the item (factoring in something extra for the convenience of ownership) people will buy it rather than rent it. However it is not clear to me that the rental model is more efficient: there is an energy cost to moving the device around as well as the cost of the people to manage everything.
Even if you think of massively advanced technology which might let you 3d-print tools, use them, and then break them down and reuse the raw material to build your next item it is still not a given that the energy cost of that would be less than just storing different objects for occasional use.