"completely correct" indeed, Will Fly. Go and wash your mouth out. This is a folk forum.
Anyway, at a session playing British or Irish tunes, you are forgetting the Second Rule. Which is "only one harmonic instrument at a time". (The First Rule is, no bodhrans). So, if you obey the Second Rule, there will only be one guitarist(or piano) or whatever, so it shouldn't matter too much which chord you play. Problems also may arise with meledeon players who use their left hands on the chord buttonsw, but they can safely be ignored. Those buttons just make a sort of indeterminate wheezing noise.