“although I think that a triangle is normally used to indicate a major seventh (maj7) rather than a diminished chord”
You are correct, I was writing quickly and made an error.
However, regarding the visualization of a bar chord. It can be a valuable part of a chord diagram because it allows the reader to position their hand without needing the fingering on the dots. Something I find useful for students. For example:
For an Emaj7b5, I recommend (and think many people do) playing this chord with both a first finger bar for the ‘E’, then a second-finger bar for the Bb and D#. However, there is no way to know that when the diagram can’t display the bar itself.
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