With respect to elves and beards, Tolkien went back and forth on the subject several times; on the one hand, he seems to have regarded beardlessness as a necessary reflection of elves’ more refined and civilised nature; on the other, he couldn’t entirely escape the cultural association of bigass beards as a badge of authority and wisdom. The text of his published works contradicts itself on this point, asserting that no-one who has elven blood is capable of growing a beard, yet also describing several venerable elves as having beards.
Though the matter was never officially settled during Tolkien’s lifetime, his collected letters and notes seem to indicate that he eventually decided elves can grow beards, but only when they’re very, very old; at one point, his notes remark that most elves begin to grow facial hair after they’ve “entered their third cycle of life”, though what the third cycle of life entails is not described.
Anyway, can you imagine the awkward transitional period when an elf has started to be able to grow facial hair, but not very well? Like, some grand ten thousand year old elvish patriarch growing Middle-Earth’s shittiest goatee as a symbol of the wisdom of long years.