When it comes to Rohloff hubs, it is obvious that the part isn't really designed to be repairable, and I suspect part of the problem is that trying to repair such a part isn't likely to succeed.
I know several people who have used Rohloffs for literally hundreds of thousands of miles without any trouble at all. The fact that I hear so many accounts of failures and/or problems on his forum leads me to suspect one of two things: (1) there is some kind of design flaw, either in the hub itself or in how R&M integrates it into the bike, or (2) e-bikes push some tolerances in the part to or past their limits. I lack the skill and experience to know which, if either, is true.
All I know is my 2017 Charger GX Rohloff is still going strong. But I am replacing chains about every 1200 miles.