Then again, Starfleet policy towards upgrading or producing the Nebula
class doesn't exactly strike me as systematic... We get a wide range of variants, this time without the helpful progression of registry numbers, and Starfleet doesn't demonstrate a predisposition towards any particular variant.
Add to this the Miranda
class diversity and the one-off nature of the Lakota
refit... Given all this, I personally favor "byzantine" over "systematic" in the Ambassador
case as well.