I agree with the fact that there are not thorough diagrams with part numbers and wirijg diagrams like there used to be. A part of it is the fault of the manufacturer, and a part of it is just the way things are made now. Circuit boards are not as simple as they once were to include comprehensive wiring diagrams. They could absolutely break the modules into different boards and label the boards with different part numbers, so rather than replacing a resistor you'd just have to replace that board. It's also not clear to me how many people actually have a comprehensive understanding of the item being sold.

But there is the obvious fact that companies want you to buy another one and not repair it. It's often cheaper for them to not repair the product themselves, and just replace the entire unit. They dont keep a surplus of parts for repairs, nor do they want to spend the man power troubleshooting and fixing the issue. It's just cheaper to replace it entirely. If they themselves will just replace rather than repair why would they bother keeping detailed documentation. If anyone cared for the enviornment more than money, they'd probably do it. But we all know how that goes.

I would also add that even previously they were prioritizing money. It was just cheaper for them to make it repairable, especially if they are going to offer some sort of warranty. It was also good for business since it made customers happy. I think at some point it became cheaper to do it the way we do now