In the hands of an expert a flap wheel may have some use.
Am no expert so My prefferance is to do what few razors I work on all by hand over alot of time.
As far as sharp edges you have the edges of the tang, the Jimps.the nose of the blade,You see so many restos that have been ruined by power tools.
They have there place for sure but like the dremels,one can do alot of damage in a very short time.