@Bryan thanks for your question. I like to set up an automated system to display measurement data. There is the need to evaluate the relations of different subsystems (shown in linked plots) over time. So I like to move the crosshair left and right and at the same time look at values in different plots. Since the values change their position in the y-axis it is difficult to find the values quickly. With one big hoverbox i dont see the plot lines anymore. In the legend, the values for a specific measurement signal are always at the same position, so they are easy to find. Secondary it is required to plot 8+ lines in one plot and with the hover tool it just gets too clouded and overlapping.
If you have a better idea, I would love to hear it. Because I’m afraid that my JavaScript skills might not good enough to pull this off.