Total hyperbole. I strongly suspect that no-one is going to be forced in taking specific backgrounds. Yes, some backgrounds might be slightly suboptimal compared to others. I won't care if the background fits my character concept.
I can only state for sure that this won't worry me in the least but following your argument technique. I'm fine with it, therefore most people will be fine with it.
On the other hand, we haven't actually seen the book yet, so we are making big assumptions that custom backgrounds are not the default with the listed backgrounds being easy-to-choose examples.