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accountable for refusing to provide basic spares
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.
I've been making an active effort in recent years to - when possible - only buy from manufacturers who make a point of providing spare parts for at least 10 years, i.e. Hope. My Nicolai/Geometron bike uses normal bearings, normal o-rings, external routing, and the geometry hasn't changed in nine years as most brands are only just starting to mimic it. I do think wireless shifting is excellent, but we need to start holding brands accountable for refusing to provide basic spares - I recently fixed my "broken" AXS rear mech with a part that cost 80 pence RRP but SRAM don't offer it as a spare because then you'd realise how cheaply they're made.
The planet is fucked, we let that happen by allowing companies to operate their businesses like this by continuing to support them.