@miriamson
See Meged Givos Olam (vol. 1, p. 96) where Rav Shurkin writes that he heard that the reason why Rav Moshe zt�l did not want to write this teshuvah permitting shaving machines in Igros Moshe is because while (according to the Igros Moshe) it is technically permitted to shave, the tzurah of a Yid is with a beard. Rav Belsky zt�l stated the same.
You still haven�t answered why all pre war bochrim seemed to be clean shaven
As attested to by countless pictures