Increased grip will help you with many other exercises in your routine including rows and deadlifts, having a stronger grip and forearms will give your shoulder
and bench press a boost too.
A heavyweight training routine will help build your forearms, heavy pressing and pulling involves a lot of forearm work and some guys will forgo doing any isolation work on forearms feeling they get enough from their routine as it is.
But if you feel your grip weakness is stopping you pushing yourself further with movements like the bench press or deadlifts, then some isolation forearm exercises will really help you out. Not only will your strength increase, your forearms will look bigger and more impressive.