Sweib91, it is difficult to understand as Rav Kamenetsky wrote as follows in Emes l’yacov Yoreh Deah 181
…Regarding [the prohibition of using] machines for shaving [the beard], this
is not just a Chumra [Halachic strictness] but a substantive [Halachic] issue,
and residents of Bnei Brak are certainly obligated to follow the ruling of the
local Halachic authorities (Poskim) [who prohibit using shavers].
In fact, I do not know whether the great Torah authorities (Gedolim) of
America [ever] explicitly permitted them; it is possible that they kept silent
because no one asked them [their opinion], and they avoided the issue,
knowing that their words would not be heeded.
As for [any leniency] that has become accepted in past generations, it is
a fact that over time there have been many improvements in the machines,
and it is possible that, as a result of these improvements, shaving with them
has become prohibited [even according to the reasoning offered for that
leniency].Accordingly, in this case, it is difficult to rely on [any] tradition [to
be lenient]…*
* Indeed, this is how [Rabbonim] should rule, that it is not just Halachic
strictness, and if a young man wishes to be scrupulous not to use any shaving
machine, his parents should not object to this and say that [their son] is just
trying to find [superfluous] Halachic stringencies.