Why is Andromeda still superior after three centuries?

Why should Andromeda remain so much more powerful than warships built during the three centuries after the Commonwealth fell?

The gap is underexplained because surviving advanced states, repeated wars, and defensive needs should have driven some rebuilding and innovation.

Andromeda Ascendant's superiority after three centuries raises a question about the setting's technological development. Even after the Commonwealth's collapse, some stable and technically advanced societies had reasons to build stronger defenses. Continued warfare makes the survival of such a large technological gap difficult to explain in this interpretation. The Expanse supplies a different comparison: a newer Martian fleet has a qualitative advantage over Earth's older fleet because Earth avoided funding replacements.