What are you even talking about. Every M1 Mac and earlier runs Linux. Even all the way back to PowerPC.
Granted, the M1 and up are not 100% covered yet (driver-wise), but they aren't EOL either. And if they were, Linux would still run anyway. Take a 20 year old Mac and you'll run Linux just fine. 10 year old Mac, Linux still runs fine. Take an M1 and it's a joy to use with Linux. Taken an M2 and it will boot and you can be pretty sure it will run very well long before it's EOL too. And even if it's EOL, it's not going to prevent you from running Linux later.
As for the PC example: definitely EOL problems there. Try getting your EDK2-based UEFI stack patched on an old computer. At some point you won't be getting certificate updates and if you either forget to install a local override or if the vendor didn't add it, you're SOL, especially on laptops where you can't disable secure boot.
Granted, the M1 and up are not 100% covered yet (driver-wise), but they aren't EOL either. And if they were, Linux would still run anyway. Take a 20 year old Mac and you'll run Linux just fine. 10 year old Mac, Linux still runs fine. Take an M1 and it's a joy to use with Linux. Taken an M2 and it will boot and you can be pretty sure it will run very well long before it's EOL too. And even if it's EOL, it's not going to prevent you from running Linux later.
As for the PC example: definitely EOL problems there. Try getting your EDK2-based UEFI stack patched on an old computer. At some point you won't be getting certificate updates and if you either forget to install a local override or if the vendor didn't add it, you're SOL, especially on laptops where you can't disable secure boot.