I should try to resist.... but I'm not going to:Granting that metaphors rarely capture the real truth of what they are intended to illustrate, I have often thought that the guillotine comparison was a particularly inept example. Understandable, though, as most people are more familiar with the guillotine than with the tool that fits better as metaphor for a slant razor.
That tool is the scythe. The way a scythe blade is made, mounted and used enforces a slice rather than a chop. Not only is that less work for the person using the scythe, it leaves a nicely cut stubble behind.
It occurs to me that a guillotine is rather like a cartidge razor in that it is relatively simple for any untrained user to put into action and achieves its primary goal successfully although messily. Unlike a cartridge razor, however, the guillotine rarely has to be re-applied to finish the job.
As one who has dabbled in sword work from eastern and western traditions, I find a sword is a good metaphor as well though also admit that even fewer people probably understand swords than understand scythes.
O.H.