[spdbrake]

The safety wire (0.41" not flimsy 0.32") will save you from losing a wheel by not allowing the spinner to start loosening during braking. Not a hard job as the spinner does not have much mass. It's not like the spinner can stretch the wire.
As far as leaving the safety loose to see if the spinner is moving is a real head shaker. I've seen that comment before on the forums and wondered why an improper safety (read that loose) and expect it to do its job? Sorta like closing the barn door after the horses get out.

I'd also trust the safety wire more the the C-clips as all photos I've seen on the installation the clip's shaft is not right up against the Spinner face, which could allow the spinner to loosen 1-2 revolutions before the clip stops it.

Sorry to soap box, I've never been let down by safety wire in the last 39 years in aviation.