I feel like ido is just a more fully-explored version of the same concept. For example, if you use C-. and C-, to rotate the list in icomplete, that rotation is

I feel like ido is just a more fully-explored version of the same concept. For example, if you use C-. and C-, to rotate the list in icomplete, that rotation is not preserved if you then continue typing, whereas in ido it is preserved, so that continuing to type characters that match the currently-selected completion isn't going to switch you to another matching completion.