Just adding something: I hereby attest that R’ Shurkin, talmid of R’ Moshe, told me, personally, halacha l’maasa, that lift and cut is mutar lechatchila.
If I recall correctly, the lomdus was in relying on the rambam, and holding that electric shavers of which their blades are blunter than a razor’s and rely on speed to cut, are like mispirayim k’ein ta’ar which the rambam mater’s.
It takes a blade as sharp as a razor to be a ta’ar. One blade which cuts hair even when in slow motion. That is all I have to say about that.
I know bochurim in litvish yeshivos who are not shaving and not yet married.
If I were to hazard a guess, they are probably Chassidish and they are in the minority, correct? Such cases are certainly the exception and not the rule in the Litvish yeshiva world.
Is there any reason to assume that most Jewish men were bearded 1500 years ago?
I don’t think that there is something wrong with shaving. We are living in a modern society now.