Ha, wow, the first time I've ever been genuinely taken aback by 'victim blaming' and of all possible places it comes from a story about a farmer and his tractor.
For starters, even the text of the article shows that he's reliant on the technician to replace the part, and it doesn't break down what of the 2 days is ordering the part vs scheduling the technician's time. It may be that even with the part in hand it's 2 days for an opening in the tech's schedule.
Further, while the article makes it sound as if there is one part repeatedly failing, the reality is that there are dozens of different sensors, and maybe only one fails per year. Your proposed solution might require the farmer to have thousands of dollars in spare parts sitting around at all times so he has replacements ready for all of them. Modern ag is already a capital intensive operation without forcing every family farm to double as a parts warehouse.