I always found it odder that nearly every single other planet was one government, one society and even one dress code.
And often, it seemed, one time zone!
Dialogue never heard on any STAR TREK show:
"Open hailing frequencies to the Zorganian High Ruler!"
"Er, Captain, it's four in the morning in their capital city."
"Oh. Well, hail him in about five hours then."
"Er, I'll be off my shift then. That will seven pm, ship-time."