It's just that it's pointless to have some "Classes" that are already covered by the system, just for the sake of having them.
I imagine you'd want a Morrowind-like system, and that's *almost* fine with me (although I fail to recognize the benefit of having your character called a specific 'class' or handicapping his development of some skills form the start - in Fallout), but it's the part about "people recognizing you" that disturbs me, because it reeks of a terribly un-fallouty system of classes/casts, whose members and their fields of professionalism are recognised by the pointy, starry hats or shiny mithril armours... What's the point?
If you want an Assassin, tag Sneak, boost Agility and Luck, pick proper perks, and voila! That's how it used to work, and it was a good system.