Not allow is not the right phrase. I know from surfing a few tractor forums a few years back, in regard to JD in the US, third party repairs do happen, parts brought from JD and the mechanic or shop verified the repair as complete - but not fully operational until a JD tech travelled out and ran their unlocking tool over the machine.

Australia - I can't tell you as in my locale there was a move away from JD so no new JD's much - so the businesses selling them exclusively declined as well. The local farms are now even moving away from older New Hollands that got briefly popular when they first hit the scene but many are with never ending issues where they saved money - like using aluminium alloy for high pressure hydraulic pump gear and shaft - oh they do bend ... :rolls eyes:

What's a new JD look like these days. Aussie's do things a bit different, other parts of the world people might gnash teeth and complain - we just don't fucking go there any more and bitch quietly. I though tend towards the more hostile reaction with subtle jabs their company / business is on a downward path and bitch loudly to any poor sod unable to find an exit quick enough.