I had a theory a while back that the 1701-A was actually the original Enterprise.
Posted this in the wrong thread…
Here it is…
The
Enterprise-A is actually the original
Enterprise.
The
Enterprise was set to be refit, but Starfleet also started work on the first new
Enterprise-subclass ship. As both neared the end, it became clear that the
Enterpriserefit wouldn't be ready to launch the class, so the two were flipped. The new build would become the
Enterprise NCC-1701, while the
Enterprise would be renamed to whatever name that new ship would've been.
However, the refit
Enterprise would become a testbed for new technologies over the intervening years. Never actually having an official name though probably having an NX designation.
Then, when Starfleet gets caught over a barrel, not really having a ship to give Kirk and his band of rebels, they pulled the actual refit
1701 off of the testing grounds and gave it to Kirk, to become the
1701-A. Explaining why it was a mess. It was a testbed with tons of conflicting technologies that were never intended to work together over the long term.
So when the seemingly young
Enterprise-A is retired at the end of the Battle at Khitomer, it is because it isn't young at all...