For me, it's because:
- I have a 5950X and it seems pointless to upgrade from there. Sure the new stuff is faster, but disproportionately so for the price. I would need to replace a bunch of components.
- I recently upgraded to 128GB RAM, and it was cheaper to do that with DDR4
- I've had 2 faulty Ryzen processors (1700X, then my first 5950X), and I've learned to wait until the kinks are ironed out.
IRL borrowing material from House M.D.