Pssst. BattleTechnology was fanfiction. FASA hadn't yet figured out that letting fans write canon is a Bad Idea.
You're using "Fan Fiction" as a derogatory term, in the sense of "Bad Writing". That's a bit harsh, given that my own published BattleCorps stories are nothing but fan fiction at the end of the day, elevated to canon. Any fiction written for a shared universe boils down to fan fiction.
The point is that you need someone to factcheck and coordinate the universe building. A Line Developer who really knows the nuts and bolts of the universe. Herb was a godsent in this respect, he really tied the BattleTech universe together and fixed oh so many issues.
As for BattleTechnology, at least the first ten or so issues under the aegis of the Keith brothers were actually pretty good, certainly on par with their novels and actually pretty close to the Jihad era sourcebooks in their "newsreel as it happens" style, complete with oftentimes excellent artwork (especially the magazine covers) and even stories hidden between the lines and across several issues. It neatly fit into the timeline as it was being developed through the novels, and even gave extra background and tie-in information, like Keith's extensive writeup on Hassid Ricol. BattleTechnology was some impressive universe-building right there.
That said, I do grant you that the later issues could not uphold the initial sterling quality. But I wouldn't go so far as to call them outright bad, even when individual pieces of art and fiction had... issues.