If I create a variable and apply it to my design, then delete that variable, the design maintains a reference to a non-existant variable. This is reflected by a disabled/missing variable badge in the field or colors list:
The problem is, there’s no way to locate all instances of broken variable references. Through the process of learning to use variables, many have been created and re-created. There are broken references all over the place, and many have gone unnoticed.
It would be amazing to have a way to locate them all so they can be swapped for new variables.