Typically, with the DX games, if you sneak around, you'll overhear conversations and by hacking, you'll get background contextual information. Talking to people usually nets useful info and backstory as well. That said, if you DON'T do those things and opt to slaughter everyone, you may not pick up as much backstory. There's usually datapads with information as well. So yeah, in a way, if you choose to handle yourself and become skilledin different areas, you might find information in a different way.
Although if you go for the killing route, usually you get some special info as loot.
Like the guy who looked sick in DX and you find he had drugs in his inventory.