Rules for writers, Tenth edition - Diana Hacker, Nancy Sommers 2021

Replace be verbs that result in dull or wordy sentences
Prefer active verbs
Clarity

Not every be verb needs replacing. The forms of be (be, am, is, are, was, were, being, been) work well when you want to link a subject to a noun that clearly renames it or to an adjective that describes it: Orchard House was the home of Louisa May Alcott. The harvest will be bountiful this summer.

If using a be verb makes a sentence needlessly wordy, consider replacing it. Often a phrase following the verb contains a noun or an adjective (such as violation or resistant) that suggests a more vigorous active verb (violate, resist).