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The key puzzle piece for me was face and whisker prep.
In the end: DE, tossable, or open they are all sharp steel
that is trying to cut whiskers and not your face.

That combined with a simple...

CAUTION... with a DE blade the second sharp edge is too
close to the other sharp edge so you are very likely to give
yourself a big old cut by hand stropping.

In the early days of DE blades...