I appreciate companies making repairable products, providing repair manuals and avoiding proprietary screws etc. but I think it's overly simplistic to say repair is the default right choice.
It makes sense to strive for efficiency. In some cases repair is the most efficient choice but in others it is not. There are always tradeoffs and sometimes durability and repairability are over-engineering for a particular use case. Individuals are not necessarily well placed to determine the most efficient choices directly. Prices act as a mechanism to incorporate information on efficiency of resource use and cheap disposable items are cheap in part because they take fewer resources to manufacture and transport. If they are sufficiently durable for their intended use then they may well be the efficient choice.
It makes sense to strive for efficiency. In some cases repair is the most efficient choice but in others it is not. There are always tradeoffs and sometimes durability and repairability are over-engineering for a particular use case. Individuals are not necessarily well placed to determine the most efficient choices directly. Prices act as a mechanism to incorporate information on efficiency of resource use and cheap disposable items are cheap in part because they take fewer resources to manufacture and transport. If they are sufficiently durable for their intended use then they may well be the efficient choice.