Re: 3 engine rooms in the TOS Enterprise's engineering hull?
"But see the different nuances in the rationalizations, with a "pre-cracked inferior spare online with batteries" vs. "battery power until inferior pre-cracked spare can be brought online"."
Yes, and I definitely rather prefer to believe they were aware they (still) had a pre-cracked one they could use than to assume the spare was already damaged when brought aboard.
"The first duty of every Starfleet officer is to the truth" Jean-Luc Picard
"We can't solve problems by using the same kind of thinking we used when we created them." Albert Einstein