Nowadays I mostly think of it in regards to how much control you have over the hardware. If you can Ship of Theseus your way to a completely different machine with completely different specs, that’s a PC to me. If you’re stuck with what you paid for, then it’s something else. A Mac Mini is not a PC in my book, but a Hackintosh is even though it’s the same OS and general hardware architecture.

But that’s just how I use the term.