That used to be true. It is not at all true for the recent Macs. The Intel Macs with soldered everything already old a worse value but the low-end Apple Silicon

That used to be true. It is not at all true for the recent Macs. The Intel Macs with soldered everything already old a worse value but the low-end Apple Silicon Macs seems to be even worse. It is unsurprising considering the limitation, the configuration is set in stone and any problem, especially on the storage means the end of the machine. If you believe that will not make their second-hand value and their longevity much worse, I don't know what to tell you. It is already happening. Even relatively recent Intel macs are worthless if they were not top of the line with lots of storage and RAM. The only thing keeping somewhat of a value is what Apple does not want to sell anymore: big display iMacs (27"). But that's really not surprising since half the value comes from being a good display in the first place... On top of all that, even low-end hardware is good enough for basic task, so second-hand inventory is piling up, especially at the low end. Macs are nice but old Macs not that much nicer than cheap Huawei's and the likes...