The ability to directly import a file which contained HEX or RGB colours would go a long way into easing map/figure production. For example the cpt-city colour ramps (cpt-city) come in a variety of formats. Is it possible to get an addon for ArcMap or Pro that reads (for example) .pg files which contain RGB codes for a colour ramp? Example of a .pg file here
It's incredibly time consuming having to specify colours individually in the Edit Color Ramp box, and if this information already exists in a standardised format (such as .pg) this would save people a significant amount of time for large continuous colour ramps.