Generation 7. I realize you acknowledged the hardware age, but it's really the difference in my own workflows and experience.
I'm still on a Gen 8 i7 (with 40 GB RAM, to boot) T480s. I take pretty good care of my machine, so it's still in superb physical shape.
But, given today's massive webapps and video calls while having my workspace programs open, I'm in Hell. A failing keyboard would probably push me to repurpose the current machine and upgrade as well (and still replace the keyboard for kicks).
If I wasn't strapped for cash, I would have bought an AMD Framework eons ago.