REI really stepped up and Ghost warrantied the entire drive system as the Continental system was NLA; they replaced the whole thing with a Gates Drive system which is amazing.
https://www.parktool.com/product/derailleur-hanger-alignment...
I'm running a 10 speed Shimano XT cassette and an XTR derailleur on my mountain bike and it's amazing. Doesn't really make any sound and the shifting is downright amazing.
maybe you yours is damaged or sth?
Electric shifting is at this point in time more of a status symbol than an actual solution.
Not to mention the constant adjustments of cable tension as the cables stretch.
With DI2 I've not adjusted or stripped down for a good 2 years and I still have perfect shifting.
I cycle a lot (more than anybody that I know personally except for my brother) and tend do do years with cables and shifters. Cable stretch requires the occasional twist of the tensioners but that's no big deal.
I can see how for you Di2 is not a luxury though. Really curious about your mileage and other contributing factors.
The cycle-around-the-world types swear by them, they are very reliable.
Don't electric shifting solutions like Shimano's Di2 or SRAM's eTap system address this? At least I thought those systems also cover the calibration and fine tuning of the rear derailleur.