You can use the same color for various tracks. Click the color bar and then click the “copy” button in the popup, then do the same in a different track, yet click “paste” instead.
Visualizing the color bars for each area (Pattern editor, Mixer, Matrix) is right-click and then almost top-down option in the context menu.
Agreed for the trackscopes, and/or a faded gradient at the top of each track in the pattern editor, above the track label.
I imagine the introduction of track colours was done a little reluctantly because of the potential for severe design clutter, and severe requests-like-mine clutter