The worlds most popular tractor brand (Mahindra) doesn't even crack the top 5 in the US.
If American farmers wan't the most repairable tractor, they should just buy the one that is used in poorer, less-connected regions of the world. Those are built for durability and repairability.
Some farm, typically agriculture. Your average cattle, sheep, or other livestock farmer will not be running a 400+ HP tractor in most cases. 50-110 hp is common for general property use such as clearing, slashing, loading, material moving. In these cases a Mahondra, or any number of others is ideal. You can get John Deere in the same size, but would be mad to do so with the repairability issues and higher cost.
If American farmers wan't the most repairable tractor, they should just buy the one that is used in poorer, less-connected regions of the world. Those are built for durability and repairability.