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Honestly? Never owned, much interest over the years, have ridden. Please don't get testy with me over a difference of opinion.
I'm not exactly sure what your point is ... I'm talking about failure somewhere in the system — not the battery running flat — so; control box issues, bad wiring, battery malfunction, water in the system etc. which are absolute failures.
Personally, I'd prefer to run a mechanical system I know I can fix relatively easily and cheaply on the go and carry on a multi day / remote ride rather than deal with something that is potentially much more difficult to fix in the field, and much more expensive too and could mean going straight home.
I don't think you know anything about Di2 or have ever ridden it