T3D’s are generally far superior than any other frigate or destroyer in combat
Look at the Hecate and tell me you still believe this
T3D’s are the combat destroyer. They are by definition the straight upgrade from T1 dessies, as command dessies and dictors aren’t as good in pure combat ability, since they have other specialized roles. They are both highly adaptable AND very strong
In conclusion, T3D’s are the strongest combat ships in that size class, and if the arc is balanced around being doable in ceptors, then a T3D would be major overkill and just OP. Use an assault frigate if the nully changes completely ruined your ceptor