at my old company we did this when we really expected icing conditions. like freezing Fog n stuff.
airports would go crazy if you every time it rains at 5 degrees start doing run ups on taxiways or runways... In 12 months flying we maybe did 3 run ups...
Mostly you see in the turnaround if you have ice on the fan blades... then we ordered fan blade deicing and on the runway we did a short run up....