But if you're observing a fleet of 100+ machines you kinda need some integration and a central location. Which in turn connects to multiple other services like weather, crop markets, fuel prices etc.
I think that is a different market than the market for dumb tractors. There might be some overlap, but I doubt the people who want to fix their own tractors are different than the corporations that are tracking 100 tractors across hundreds/thousands of fields.
Yes, but how useful is the integration?
The sprayers/spreaders can be connected cheap computer to achieve most of what you describe.
I used to do literally that but in aircraft. Must be easier and cheaper in tractors