The M8000 derailleur/shifter on my bike are from 2017. The cassette is M7000 (SLX) which is also that old. I've done at least 25000km on this drivetrain. Probably closer to 30-40K. I don't clean it regularly. Maybe once every 2 years. Last year I shamefully fell behind on maintenance and rode it dry almost all summer. This drivetrain still shifts perfectly and new chains don't skip on the cassette. Point being that if this anecdata is any measure, even old, used compontents from these series might work great, if you find some cheap deal.
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