Aforementioned color accuracy dependent industries would love this need-gap to be addressed, Evident from newer high-end mobile devices having 100% DCI-P3 color gamut coverage.

Perfect color accuracy is not possible without external display calibration hardware but I think this need-gap could be addressed to a reasonable extent with color management library at the software level. Android offers ColorSpace API to convert between different color spaces and iOS offers System Colors which automatically adapt to the system settings.

A 3rd party library which provides helper routines to these APIs depending upon the displays and the color to be presented; could reduce development time and create more reliable, accurate colors for the apps. Due to the extent of this need-gap I think this could be a viable open-source project.