I have no real evidence to back this up, but it's possible that the Concordat originally relied on small craft rather than aerofighters.
Before the Feds introduced the Centurion, the only known aerospace fighter the Taurians had to worry about was the Capellan Firebird, and frankly, it wasn't great (Pretty, but not great).
Small craft are also better for hit and run attacks than aerofighters because they can be launched from carriers several days away from the target, rather than relatively close by where the carrier might still be at risk. This could be seen as desirable if the Concordat is worried about facing a much larger power better able to absorb losses.