Thanks for asking this question and for the links to prior posts. I’ve been wondering the same thing and intended to search the forum for this concept.
Do any charts show volume as a stacked bar? I wonder if it would be helpful to see the volume and at a glance see if the volume was close to 50/50 or more like 90/10… Ideally the chart would have the color with the higher percentage on top in each bar. So, for example, if selling volume was 66% of total volume, then the bar would be 1/3 black/grey on the bottom and then 2/3 red above that.