Not if your bike gets serious miles on it. The rate at which I got through gear cables and outers before DI2 was quite extreme. To keep good shifting I'd have to change the both at least every 2 months, and ideally do a strip down and deep clean on the derailleur.
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.
That's an interesting observation. What conditions do you ride in?
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.
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.