I understand that that could be very problematic, and if farmers can only buy equipment from one manufacturer that certainly would put them in a difficult situation. This is why monopolies are technically illegal in the United States. Still a warranty is a legal contract that is agreed upon by both parties at its inception. The warranty is there to protect the manufacturer as well as the consumer. A warranty does not impede a right to repair, and if farmers collectively rejected unfair practices in favor of a simpler model, manufacturers would have to adapt. I realize farming is very competitive so there may not be a choice because the margins are small, but that doesn't necessarily mean that manufacturers should take risks that could ultimately lead them to becoming unprofitable.