in the exposure tab there is a histogram displayed as solid area in the tone curve diagram. However, no histograms are displayed in the colour management’s RGB-curve tool. Is there a reason for that?
I would find histograms of the respective channels very helpful in adjusting the RGB-curves. I would even argue for an additional log histogram, e.g. shown as a thin line with 1 dex indicated by a vertical bar (also in the tone curve diagram in the exposure tab).