I think you’ll find this is a discussion board so I’m discussing the issue.
I refer you to the original start of the thread. Please reread, if you ever did.
But to recap, coloured belts are useless at denoting the wearers level except to those within the very same discipline. This is because there is no uniformity of colour graduation, or indeed, number of belts from beginning to shodan/blackbelt across all arts. The Japanese kyu system uses numbers, which are ubiquitous an used in every avenue of life and to land on the moon and stuff. Therefore it would make sense to quote ones kyu level rather than saying “pink belt with 2 my little pony patches“ for some meaningful idea of a person’s level to other people who might not be within the same style/school or martial art.
Your turn….