Time and Space are two commons parameters (and also natural parameters) to measure the complexity of the problem. I am not able to understand the motivation behind defining " Descriptive Complexity". I search on the internet and find out that it is the complexity of expressing some property of the input. Take the example of the sorting problem. Time and Space seems to be a natural choice. I am unable to come up with an example or a problem which immediately implies the importance of defining the " Descriptive Complexity ".
Question : What is the motivation behind " Descriptive Complexity "?