Earlier quoted context omitted.
Regarding the first part, I'm pretty sure that Steam had an offline mode from the start. Perhaps it required an initial connection to set up an account, though. I was lucky to be in an area that had very early access to DSL, so it wasn't a problem for me. The "always on" features was actually pretty awesome and novel if you had a permanent connection. In general I've been impressed by Steam from the start. On the oth…
Steam wouldn't have happened if Windows had a proper package manager (and if Valve hadn't been screwed over by Sierra). I'm wondering about what cleanliness you are talking about, after all Steam (thankfully) never got a 100% market share (Games For Windows Live, Stardock's Impulse, GamersGate, Matrix/Slitherine, Blizzard games, Good Old Games, Ubisoft's horrible launchers, various boxes-only games, indies...) - if a…