Originally Posted by TJJones
I always thought it was a bit hokey that Starfleet would change its symbol for one incredibly-famous starship (considering that there were probably incredibly-famous starships once a generation).
The idea that Roddenberry proprosed was that no other starship was as
incrediblyfamous (and history-making) as the Enterprise
though and that was the reason why its insignia was chosen to represent the entire fleet.
Given that the Federation was in something of a cold war with both the Klingons and the Romulans at the time, the decision was probably more of a public relations thing than anything else.