Something else you need to take into consideration (if things like this really worry you) is that in the overall harmonic picture, you have to consider not just the chords you're playing, but how those chords combine with the notes you're singing. You're not always singing chord notes, and even if you're playing only triads, the non-chord notes you're singing form all kinds of added-note chords. I could come up with thousands of examples, but I'll leave it to you as an exercise.

Don Firth