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In universe: Spock explains in the Star Trek: The Original Series episode "The Enterprise Incident" that Starfleet Intelligence (an early reference to Section 31?) determined that there was a military alliance between the Romulan Star Empire and the Klingon Empire resulting in the Romulans using "Klingon design".

Real world: money-saving, as NBC cut the budget in Season 3 of Star Trek: The Original Series.

The story is that a janitor accidentially broke the Bird of Prey model used in "Balance of Terror" and not knowing what it was, threw it away, but the origin of that is unknown so I don't know if it's true or not.

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