it could be, but it gives you better control over the overall situations. no AI means all dialog options are available. so if you do Role-play both of your main characters, you pick whatever you feel right for them to say.
AI presets aren't for role-play for me, "loyal" seems to agree with everything and "independent" disagrees, regardless of the issues? you can have one pragmatic and the other romantic...so whenever pragmatic/romantic issue comes up, you can have the two disagree and do some RSPs...