Deere employee, but speaking for myself, not the company.
Farmers buy Deere because they are the most repairable. The dealer is just down the road, and has the parts that you need. The things you cannot do yourself are things that farmers think "I wouldn't do that anyway".
> they are the most repairable.
That's a really weird way to spell "incumbency and network effects".
In fairness, you're not wrong, but that seems to be a very specific framing that hides a lot of what this whole discussion is about.
It is more than that. It is also the dealer has the parts you need, even for older stuff. Deere is well known to stock replacement parts longer than anyone else, and can get replacement parts where others would say not possible. network effects and incumbency help as well, but Deere is the most repairable.