Please don't take this as a criticism because it isn’t one. Fortunately, all the posters didn't directly say to remove the feature, but some on other forums have, and they have been shot down in flames for being so thoughtless
I think having the Negative Colors toggle there is fantastic. Otherwise, it takes many screen taps to access the Toggle in Accessibility settings. People with normal vision typically can't see the point of it and can'tr wait to get rid of all traces of it. Before, on a Galaxy S3, there was a negative colors widget. It went probably due to whinging from thoughtless selfish types who just wanted it gone.
Newsflash - visually impaired people generally can't use a phone without it. About 8% of the population have some form of vision loss. Look it up. That's a large chunk of people to ignore.
tamxir