Finger strengtheners can be helpful for guitar players to build up finger strength and endurance, but they are not necessary for everyone. While finger strengtheners can be effective in increasing grip strength and dexterity, it's essential to use them correctly to avoid causing injury or strain to the fingers. Furthermore, it's important to note that simply using a finger strengthener does not automatically translate to improved playing guitar. It's still crucial to engage in consistent practice and to use proper technique and form to develop the necessary skills and abilities for playing guitar.