Agreed.
I don't know how I feel about this. I love the freedom that Bethesda games afford, however, I've always fully embraced the main thread that the games were built around. I let my pseudo-desire to find my father and get answers drive and shape my protagonist in FO3. I let the discovery of being Dragonborn impact my PC in every game I played. I imagine I'm going to let the fact that I "had" a wife and child affect the development of my character in FO4.
In my opinion, I feel like the vast majority of people enjoy having these things to build off of and affect how they interact with the world. Having some character development that is outside of your hands can really immerse you in the world and let you experience something you couldn't otherwise. The Bioshock games jump readily to mind. You had a set gender and identity, but you still experienced the world on a first hand basis, and so you got to know the character (as much as they were defined) and BE the character. To me that is a richer experience.
That said, I respect that some people like to get really crazy and design all kinds of different backstories and characters. I don't have a problem with that, however, for the sake of the experience as a whole, I'd much rather that those people have to use a little bit of imagination to play the character they want, than sacrifice a deeper experience for the casual fans and others who enjoy a more personal set up. In short, if we all can't have what we want, then I'll gladly support the decisions that deliver a richer experience, even if it means sacrificing a few freedoms.