Nothing I do with secure data hard-requires that level of portability, and for insecure (tracked, DRMed, closed + signed firmware) mobile use a Lineage smartphone is good enough for what I do. A laptop with closed / signed firmware simply doesn't gain me anything worth having over the phone.
My personal desktop is a Blackbird. The couple of old x86 apps I can't easily ditch (because they are open source but need MVC APIs and I'm too lazy to write the shim layer) I just forward X over SSH to an old corebooted Opteron box.