100% correct and it gets even worse. My buddy down the road with his quarter million dollar JD machines, cannot even change the oil filters or air filters until the ECM 'tells' the dealer it's time.... and no 'generic filters' either. Has to be genuine JD because the filters themselves have built in electronic monitors that gauge the restriction, so when it's time to replace, the on board electronics 'communicate' with the dealer. Don't know about oils but the filters I do know about. of course the dealer has to do the service too (farm call).
I will say that JD has it pretty well sewn up far as no right to repair, but the others aren't far behind.
Not familiar with CNH or Case IH but with Kubota presently, if you purchase a T4 final tractor (common rail ECM controlled) from Kubota, don't think for a second that you will able to 'fix' an issue in the barn because Kubota has used proprietary connectors on their ECM's as well as other emissions control modules and only a authorized dealer has a scan tool capable of accessing the connectors. IOW, you have an issue, only the dealer can diagnose and repair it, not you. Have to have the Licensed by Kubota Diagmaster scan tool and you cannot buy one. In fact a dealer cannot buy one either. The tool is 'leased to a dealer'.
My personal view is that tractors and ag equipment should be like automobiles, IOW OBD so you can purchase a scan tool and download the codes and make the necessary repairs yourself, using compatible parts, not their parts at their prices.
Whole thing is tantamount to a large crock of poo in my view and why I won't buy a new tractor. Why would I spent multiple thousands of dollars (the units I run start at 60 and go up) and be enslaved to a dealer for everything.
I hope the farmers out in the plains win their suit against JD concerning 'right to repair;. Fine with me and at that point I might consider a post 4 tractor, but not until then.