Well, you're being rushed by the requirement, so I guess that can't be helped. And the last two updates were sufficient to draw the general situation. For the next Perso-Roman War, we can't expect the same steamrolling Persia could pull off in OTL, for sure. I can't expect them to lose either here, though. Hard to say, though I can say the eventual conclusion will most likely be epic stalemate that will leave both sides exhausted.
If there's any actual lack, it's about the effects on Roman society not deeply enough explored, so we don't really get about how much they actually differ from Persians.