12 speed is the latest and greatest and everything below is "obsolete" as far as bicycle marketing is concerned. Given how dirt cheap 11, 10 and 9 speed parts are in 2024, what exactly is the advantage of falling back so many generations to 8 speed?
Because 10 speed is less durable than 8 speed? Ok, sure, but 10 speed is CHEAP AS HELL. Replace those 10 speed parts when they wear out. Who cares.