I actually think the assertion that the color of your text fields is going to be the determining factor for potential users is not a sturdy one. A lot of the time, what users are looking for is the thing that solves their problem and it doesn’t really matter how it looks as long as it’s usable / understandable.

Also, while this design approach is probably more aesthetically pleasing to people like us, it might not be for someone like my grandpa who may get confused.