Looks perfectly fine to me
I think back needs quite a few exercises, if you think about it people have no problem with someone doing 3 chest exercises, 3 shoulder exercises. So the front muscularity is okay to have 6 exercises despite being pretty small muscle groups, but your big old complex back can only do a few?
Give it a go and see how you go, some people respond really well to more volume for back with a variety of exercises and grips.
It also depends on how you have been currently training, what kinda results that achieved and what your goals are. And as mentioned above, progression is key.