The ‘NM’ that complement YAGNI stands for No More.
Adding to the YAGNI principle which stands for You ain’t gonna need it, YAGNINM stands for cases when you only keep an existing feature for backward compatibility sake when it is clear that this feature is not required anymore.
You just fall in love with the fact that you have this feature and have hard time getting rid of it, although having it complicates your design and has no or little value at the present.
