Should the "focus update steps" consider an input element's "input activation steps" rather than just its "activation steps"?

[trflynn89]

What is the issue with the HTML Standard?

Step 2.1 of the focus update steps begins with:

If entry is an input element, and the change event applies to the element, and the element does not have a defined activation behavior, ...

Unless I'm mistaken, every input element has an activation behavior, described here:
https://html.spec.whatwg.org/multipage/input.html#the-input-element:activation-behaviour

The activation behavior for input elements element, given event, are these steps ...

However, not every element has an input activation behavior. For example, in the button state, "The element has no input activation behavior.".

Should the focus update steps be referring to the input activation behavior here?