Not nonsense but it does not cover all the bases.
Shave cream in one of those cans is a racket. As
marketed and shown on TV it will not help get you
a good shave.
Most of us find that an early application of water does
most of the softening making it possible for the razor
to do what it should. After that it is the lather
that helps keep the blade sliding on skin as it
snips off our pre-soaked whiskers.
Many of us are no longer are the dirty crusty dirt farmers
where soap was so very important. Having said that
the process of building a good lather involves soap,
water and TIME.
The racket is that the cans of goo shortcut the soak time
and cleaning that so improves the shave. This shortcut
mandates that tossable blades have slick guards and
more to compensate for the lack of a well built lather. Medication
in the goo compensates in part for the lack of general
sanitation that a good wash and face lathering gives ya.
Anesthetics hide the pain when there should not be any.