No, Joshua is parroting a good point actually.
You are 100% dependent on Deere for repairs to any part of the equipment that is electronically controlled, including the engine, and any feature that is implemented as a software subscription. like the GPS functions. The software features are what make these machines worth it over say, your old trusty 70s or 80s Deere, and are essential to the factory farming model that is popular these days.
You cannot run your own software on these things, or modify the provided software, without extensive reverse engineering, If you do that, and offer your solution to other people, Deere will sue you. As I recall, Deere also makes it really difficult to develop or use any 3rd party solutions that compete with Deere's in-house offering.
It took years of legal wrangling to get Deere to make available the basic diagnostic software, which you need to make repairs on any part of the equipment that is electronically controlled. You of course have to buy a subscription for if you want to use it, and keep paying if you want to keep using it.
Deere is the Apple of the agricultural world.
Oh and, you haven't been able to load unsigned drivers on Windows for many years now. Yes, you can turn off driver signature enforcement for testing purposes, but it's a pain in the ass, deliberately temporary by design, and isn't something you could realistically expect an end user to do. As well, it is only a matter of time before Microsoft tries pushing a legacy-free edition of Windows, which will only run signed code obtained from official sources, just like they've already attempted with S-mode.