To me, "personal daily driver" sounds like where you'd do online banking. A MacBook from 2015 can't run any OS newer than Big Sur, which is EOL right about now. And it sounds really imprudent to do online banking from an insecure device.
It should still be able to run an up to date web browser though, right?
If one is that concerned about someone exploiting an OS level security flaw to exfiltrate their online banking credentials (wildly unlikely), they should just be doing that stuff in a VM or similarly isolated environment anyways.
> It should still be able to run an up to date web browser though, right?
For a while, yes, but the browser being up-to-date doesn't make an EOL OS safe to expose to the Internet.
> If one is that concerned about someone exploiting an OS level security flaw to exfiltrate their online banking credentials (wildly unlikely), they should just be doing that stuff in a VM or similarly isolated environment anyways.
Just doing sensitive stuff in a VM isn't good protection at all, since a malicious host can trivially compromise the guest.
If this is your personal threat model, I commend you on an exciting life well-lived that appears to entail sophisticated personal protection of the GPG keys and Bitcoin you need to run your business empire securely.
Many US bank websites have so few features I'm not even sure what hacking mine could get someone. They can transfer from my checking to my savings account?