The suggested functionality would make a huge impact on the ability to provide important information to the user in a way they can understand it. Some visualizations have fields that often don't even lend themselves to being useful to read in a tool tip.
Would truly add some flexible functionality. I have a matrix that has multiple measures that are inter-related (QTY, Unit Rate, Hours, Unit Price, etc. Putting them all on a matrix at the same time is confusing for the end user. Adding a slicer to select the measures that the user wants to see makes for a valuable analytic. Using Switch is the only current option. However, a better option would be to just build the functionality into the matrix and slicer essentially building a field filter.
This would be a really useful feature to have especially for certain visualizations like the Bubble Chart where you could have the Color Saturation and the Size be essentially the same value only one is the absolute value and the other is the positive or negative value.
We’d definitely like to build this feature – and thanks to your support and votes we’re moving it up our backlog. We’ll update again when we start work on it! Thanks!