You may have started to see the MAG attachments in the gyms. They seem to be useful in those that find grip strength/endurance limited them from feeling the back effectively in back training. Unlike wrist straps these attachments don’t necessarily eliminate the grip from the equation however does allow some to feel to involving the back musculature in pulling strength exercises.
I still rate grip training very highly but if you are looking for a different feel by changing the mechanical positioning of your grip to allow better feel in the targeted muscles then these maybe worth trying. By no way are they necessary but that could be an additional tool to use especially for those that find it hard to feel the targeted muscles involved in pulling movements.
You can purchase them directly from there website at https://www.maxagrip.com