Boroughs in London, councils outside of London, seem to be moving more towards aesthetic considerations ,i.e., they’re changing the colour to darker greys so it blends in more. By definition, if it blends in more, it’s harder for partially sighted people […] to actually see.
This is the same as the “visually pleasing” tactile paving the UK sometimes has.
Do you have a pic?
Tom Scott (2007): The Little-Known Patterns on British Streets. URL: https://piped.video/watch?v=cdPymLgfXSY&t=139