Not trying to be dramatic, but there are important differences between mechanical shifting and electronic, say, shimano di2.

First, I gotta admit that electronic shifting (di2) is cool and it works better than mechanical (with some caveats, like charging the battery/s, etc.). And that improved function can be kinda intoxicating and can make one forget what happens when electronic shifting doesn't work. Because there are major qualitative differences between how mechanical shifting fails, and how electronic shifting fails.

Mechanical shifting can fail in a multitude of different ways, but it fails very rarely, and, when it does fail, very few of those failure modes leave a resourceful rider completely SOL.

Unfortunately, electronic shifting has only a couple of failure modes. And most of those failures do leave a rider SOL, or riding in only one gear, which is kinda the same thing.

Essentially, that was the only thing I was trying to say.

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