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I don't think general consumers should be using electric gearing
I'm a general consumer and I use electronic shifting on almost all my bikes for a number of reasons I've posted all over this forum and others for years. Mechanical shifting might have the higher longevity but I'm going to choose the option that works better and causes less pain.
I also have 20 year old bikes with basically the original mechanical shifting still working just fine on them.
What to do... what to do...
I think you have to include batteries in this. At somepoint they're going to change them, and the older ones will be hard to find.
I reckon in 25 years every single existing wireless groupset will be in landfill, or on bikes that won't be used because there are hardly any working batteries that hold their charge left.
Maybe that's a bit dramatic (it probably is), but it highlights that the problem and why I don't think general consumers should be using electric gearing. In my mind it's just a reason to sell someone a new bike, remember they make money by new bikes, not by people keeping old bikes.
Meanwhile I'd wager there will still be fully working mechanical groupsets still operating perfectly, including ones that might even be 'old' now.