We already have a budget escort in the form of the Nettle, having the Assault Ketch be a little less common isn't that big of an issue given how capable each one would be.
We will have over 100 of them for barely any Psy-Scope or Starcrystal expenditure before we need to worry about additional costs and even after that compared to how much more expensive outfitting a capital ship would be this thing isn't that big of a burden.
Another thing to factor in is build time, if you want capital ships with Fatetwister or Starlance batteries you're looking at several turns of build time. A Ketch takes a single turn to build so if we ever have an emergency where we need naval killing power NOW we can crash build a ton of these and have them ready in one turn Vs needing to wait several turns overwise.
We will have over 100 of them for barely any Psy-Scope or Starcrystal expenditure before we need to worry about additional costs and even after that compared to how much more expensive outfitting a capital ship would be this thing isn't that big of a burden.
Another thing to factor in is build time, if you want capital ships with Fatetwister or Starlance batteries you're looking at several turns of build time. A Ketch takes a single turn to build so if we ever have an emergency where we need naval killing power NOW we can crash build a ton of these and have them ready in one turn Vs needing to wait several turns overwise.