Using types in selectors reduces the flexibility and narrows the applicability of CSS styles. Classes should be preferred as they improve the understandability by giving elements a context-specific name. For example:

.myBox span {
  color: black;
}

This styling can only be applied to a limited subset of all containers with the .someThing class. Furthermore the reader cannot identify what the span actually represents. An alternative using a class instead of a type does not have this issue:

.myBox .headline {
  color: black;
}

The intent is clear and the contextual understandability improved dramatically.

Noncompliant Code Example

span {
  display: block;
}

.mybox div {
  color: red;
}

You can exclude certain types via the configuration of this rule as e.g. the anchor type is a valid exception from this rule as it should always denote a link of some sort.