Once and Future wrote:
Just talking from personal experience. My spikes clog up just as much when it's extremely muddy and I've never ran a fell race where it's all on peat.
I find my fell racing shoes probably provide better traction going up or down extremely muddy hills than 12mm spikes do. Maybe I need to use 15's?
Do elites wear trail running shoes for xc?
Spikes don't clog up as much as the spike has less to stick too.