Sure, but most people wouldn't even want to attempt a board replacement and would rather take it to a repair shop. Replacing an entire section of a device because one tiny part is broken is not helping the e-waste problem repairability is trying to work on.
These companies just want to upsell you to a new device, they want to group parts into assemblies to increase the price, and if the repair is going to cost just a small amount less than buying a new device, people are likely just to buy a new one, now that old device becomes e-waste and the company made a sale. Instead of it being a cheap repair, keeping that device going for as long as possible.
Nintendo could benefit greatly by just allowing these kind of projects, but that would be out of character and we can't be having that.