No one argues that the current FAF color list is perfect, but there is no functional reason to expand beyond 20 colors. There is barely a functional reason to even have 20 colors beyond not making the last dude in an 8v8 sad.
If people want to optimize the current list of colors I think anybody would be for it, but every list I've seen has problems with making it way harder to communicate what is going on with teams because no generic person has 3 variations of green in their vernacular that can be explained to people that have English as their 2nd or 3rd language or just not a language at all.