"Shy
The danger in using them routinely is ........?"
Xnr, I didn't mention danger....why danger?
As Nick said, there isn't one. It might just not be appropriate. If you are operating to Performance A / Class 1 it isn't normally called for. However, to give an example, if I was operating from a runway with blowing snow, I might elect to use the technique to reduce the chance of disorientation from seeing recirculating snow in the beam of the searchlight.