>Then why even manufacture them and cripple them?
They cripple them because they know people want bigger tractor without emission control so they sell it as a less powerful tractor and then just expect people to break the law and turn the screw, and everybody is happy.
========= re: below due to throttling ========
>Thankfully, it's not illegal to own a screwdriver and nothing changes there. There's absolutely no relevance between right to repair (not right to break emission laws!) and the situation you describe.
There is because on the John Deere tractors you can't set the "screw" unless you have right to repair the engine system. John Deere has no screw because they're in the US and they're too afraid of US regulators.