Is this recommendation for a fighter to take the Weapon Master feat entirely useless?

Tasha’s Cauldron of Everything includes some recommendations for building a Battle Master fighter. The introduction to the section says:

Below are recommendations for how you might build a Battle Master to reflect various types of warriors.

Each of these builds contains suggested fighting styles, maneuvers, and feats. Those suggestions are from the Player’s Handbook, except for the ones followed by an asterisk, which indicates an option introduced in this book.

Two of these builds (Duelist and Gladiator) list the Weapon Master feat as a recommended feat. Weapon Master says:

  • Increase your Strength or Dexterity score by 1, to a maximum of 20.
  • You gain proficiency with four weapons of your choice. Each one must be a simple or a martial weapon.

The Proficiencies section of the Fighter class says:

Weapons: Simple weapons, martial weapons

Fighters are proficient in all simple and martial weapons.

Am I missing something here or is the Weapon Master feat a complete waste of an ASI for a fighter? Is there some way that taking the Weapon Master feat as a fighter is not entirely redundant?