I expect devices which go through constant charging/discharging to start noticeably degrading after 500 cycles, and to be very degraded by 1,000 cycles. Have consumer goods progressed beyond this yet?
(1) Battery is nearly useless.
(2) The vendor decided to artificially slow the device with forced updates, or worse, the vendor decided to publish a list of CVEs and then declare your device ineligible for the necessary security updates going forward.