Manufacturers have the right and responsibility to set end of life support for aging technology. You can't expect a manufacturer to build parts for something that has long since been obsolete. Owners have the right to repair, but manufacturers have the right to Intellectual Property (mostly software code).
Anyhow, I'm no expert on JD, but there are alternative brands, and people should know that buying a premium brand incurs a premium price.
I drove a GPS equipped JD with grade attachment a couple summers ago. My job was to make the turns at the end of rows and get within a couple feet of where I need to be, and then push a button to enable self steering. No reason it couldn't be equipped to make the turns and adjust the blade depth, too. Farm fields are the perfect place for automation.
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