I agree. Consistency isn't mostly (isn't even mainly) about corresponding facts. The authors of the five House books, plus Star League and Periphery created a sprawling setting that made sense in toto. The mood of the work is consistent. That's hard to do, even for a single author within a single book.
BattleTech is pastiche. It treats man as a tragic figure, history as a dirge that rhymes, ambition as folly, glory as madness, peace as a soap bubble in a storm. And yet it laughs. It's probably the only game that makes you a better person just by playing.