The subjunctive mood and really anything involving modality is complicated. Paul Portner has a book on mood which is probably a good overview if you’re willing to get technical. Right now I think of moods as expressing presuppositions on the set of possible worlds you quantify over in a clause. I don’t think it’s often a good idea to try to get people to speak a native language in a way incompatible with the language as they acquired it in childhood; it adds extra cognitive load and probably doesn’t affect how people reason (the exception being giving them new words and categories, which I think can clearly help reasoning in some circumstances).
The subjunctive mood and really anything involving modality is complicated. Paul Portner has a book on mood which is probably a good overview if you’re willing to get technical. Right now I think of moods as expressing presuppositions on the set of possible worlds you quantify over in a clause. I don’t think it’s often a good idea to try to get people to speak a native language in a way incompatible with the language as they acquired it in childhood; it adds extra cognitive load and probably doesn’t affect how people reason (the exception being giving them new words and categories, which I think can clearly help reasoning in some circumstances).