I
don't think you're wrong. But I do think this context is different. I certainly didn't mean any offence and I apologise if I appeared rude.
I think what SBM wants to see is the notes in the scale that will be played, not the structure of the chord.
If one thinks of the chord structure, then all minor triads will be (1,b3,5), which doesn't tell him what actual notes will play and I think that's what he wants.
It's probably tricky anyway as we'll often play chords in inversions, and that simplistic numeric indication may not show that, or may confuse if it does show it.
Musically we might also say something like "play a major triad on the third", or play rootless chords, which may be even more confusing.