Perceptually uniform color gradients are both more intuitive for human brains to connect gradients to a color, and are more compatible with various forms of color blindness than are most of the color scales in Spotfire. I'm tired of manually coding them in with this tool:
https://waldyrious.net/viridis-palette-generator/
Please add some of these to Spotfire defaults. Some examples:
https://www.kennethmoreland.com/color-advice/
https://cran.r-project.org/web/packages/cetcolor/vignettes/cet_color_schemes.html
The Spotfire built in color palattes could benefit from a bit more awareness of how users experience color gradients, even the non-color blind. An example: https://betterfigures.org/2015/06/23/picking-a-colour-scale-for-scientific-graphics/