So yeah, will "last", in the sense of getting security updates, for one more year probably, which is indeed "lasting longer" as the salesperson said. Of course

So yeah, will "last", in the sense of getting security updates, for one more year probably, which is indeed "lasting longer" as the salesperson said. Of course Apple don't make any guarantees about how long they support products, so you never know. My 2017 iMac Pro still gets the latest OS whereas my dad's 2017 iMac does not. But looking at the iPhones, where the iPhone X lost support one year before the iPhone XS, which was very similar, I think it's a reasonable bet to say the M2 will lose support a year before M3.