The reason manufacturers are locking down access to fix equipment they sell is that it allows them to increase profits by controlling who can repair items and when, period.
If you picture a simple vehicle with teeny-tiny wheels on the front and big wheels on the back, and Old MacDonald in overalls and a straw hat on a bucket seat then no, out-of-control tractors aren't a huge problem.
Of course, none of the "tractors" like that are locked out.
If you picture a gargantuan technological wonder weighing tens of tons, guided by GPS, with robotic arms and machine-vision guided implements and and an enclosed, air conditioned cabin that is the size of Old MacDonald's "tractor" by itself, then yes it is.
The dirty little secret of the farm equipment "right to repair" movement is that "Old MacDonald" farmers don't want the right to modify their farm equipment so that they can fix things when they break-- large corporate farmers want access to software tools so they can strip out emissions equipment and safety features to more cheaply operate their machinery and they're funding a fake "grassroots" movement to try and get their wishes.
All of these locks started about 10 years ago, about 10 years into the fully-computerized phase of farm equipment. Farmers were chipping and otherwise modifying their vehicles to increase horsepower, lower fuel usage, enable "dirty fuel", and circumvent emissions warnings. Engines and turbos were blowing left and right and the dealers and manufacturers were left on the hook to pay for things because the farmers would pay for service contracts, chip their harvester to get 10-25 extra h.p., blow the engine, take off the chip, and then send it in for repair with a sheepish "oh geez I have no idea what happened LOL" look on their face.
So the manufacturers starting locking everything up.
Every elementary school in the Midwest is adjacent a corn field. You need to get out more.