If you decide to spend thousands on a tractor with an AI sophisticated enough to do everything a regular human tractor driver does, but nothing other than that; and if once you buy that piece of equipment you've committed yourself with a service contract for rest of the equipment's life; then what you are doing is basically either handing over your business or something equivalent to hiring a human being for a 20+ year long contract that only does one job.

I would never do that, unless I was actually renting the land. Some people do rent their land, and perhaps committing to such a contract could make sense to them.

The alternative is to simply buy a tractor and then hire someone that does many other things, like driving other tractors, cleaning them and do some repairs and maintenance. (If I could do that to my own AI-powered tractor, maybe then I would buy one). This is about who controls your business.

I believe there's future in modularity, but I also believe some kinds of equipment won't fall into the automation ratchet or the "evolve to AI or die" category.