Understood - to be fair, tech usage for 23rd century vessels was very inconsistent.
For years, people have been trying to rationalize early in-dialog technobabble to try to reconcile it with what came later in TNG. TOS' implication that power came entirely from the nacelles flew in the face of TNG's M/AM intermix taking place in main engineering. TOS actually flew in its own face by having multiple points where dilithium crystals would be located throughout the ship. Were they sources of power or catalysts for power distribution? For a time, both, apparently. Further, while TNG closely resembled what was happening in the TMP main engineering, there were still some oddities, especially when they introduced the laterally-placed "reactor room" as more of a dramatic location for Spock to die in TWOK, rather than a facility that served a viable ship function.