I grew up on a farm, but decided that farming was not for me; so I became an Electrical Engineer. Not many farmers have the "hacker" aptitude. These are people who get up early, work hard, plan their day, work the land, and make the best decisions they can, with the data they have. They go to bed each night, weary - and sitting down at a computer and placing their "livelihood at risk" by hacking code they do not understand, is not very highly rated on the risk/consequence table.

they screw up one variable on the tractor, they either disable it, or cause something to break - or - they pay an inflated cost at the dealership and operate under warranty of the manufacturer.

Now, if a farmer can SEE a part that is apparently built with the same quality, is half the cost, and fits in their tractor at half the cost - that's another matter.