So, using a ratchet to drive a phillips bit for example?
I have blue point bit sockets. There are 2 versions, one like the Lisle set where it is all piece. The other is a proper bit socket. I don't really use or care for either. Cheap bit sockets are often soft. I use these things when I feel I need more torque than a screwdriver can provide. So fundamentally, I guess my answer is no, you don't need them. When you need a ratchet, it's either because you have no space for a screw driver or because you need more torq than a screwdriver can provide. In which case, you need a bit socket of greater than normal hardness. The Snap Ons are good enough. Blue point, craftsman, lisle are all not good enough in my experience.