Thank you for your feedback on ways to improve our product. The combo chart will be enhanced in the coming releases, reference lines will hopefully make it during 2020.
A customer asked me if he can create a chart like this . It´s a complex combo chart with stacked bars, a line showing the total amount on each Year and in the bottom a measure showing the variance over each year.
My answer was no. We can do this using the standard charts. It will require an extension maybe.
By the way , this chart was created with Tableau based on a mock up created in Excel. So the result was very close.
The combo chart will be improved but it will be hard to cover all possible chart variants while maintaining ease of use for the casual user. A tip is to use the map chart for "impossible"/"infographic" charts, here's an example from my next collection of viz tips:
