Reno:
The debates on this that I have heard are basically twofold.
One is that a razor knife is the 'tool' that supposedly has the most 'cuts' recorded against it, as oppesed to a 'regular' knife. (Like a hawkbill)
IMHO, a 'razor' type is used for one convenience; that being the replaceable single edge blade. Convenience, as opposed to being able to sharpen a 'regular' knife which takes some skill, and yes more time than swapping a razor blade.
Another reason I have heard is the razor blade damaging the conductors. Blame the tool, or blame the person?
