Re: TOS Klingons explained?
"we do not speak of it"
I would have been perfectly happy, if it had been left at that, even if not knowing the in-universe explanation became a permanent running gag like what is the sound of Morn's voice
Not all fans wondered about, cared for, or needed an in-universe explanation. It was better not knowing.
“A life is like a garden. Perfect moments can be had, but not preserved, except in memory. LLAP” — Leonard Nimoy (1931-2015)