It's not just the framerate mismatch, OLED's un-pulsed presentation with almost instant response time greatly reduces the perceived motion smoothness of lower framerate content compared to eg, CRTs or plasma displays
It’s happened to me since before any cinemas were digital. I only figured out why by trying to play games below 30 fps. At least for me, it’s definitely the frame rate.
Real is good, it’s ergonomic and accessible. Until filmmakers understand that, I’ll have to keep interpolation on at the lowest setting.