literally, its unconstitutional. i own something i have no control over.
it sits right next to me and somewhere someone making bad decisions is not allowing me to play something i paid for.
10-20 years ago it was considerably more difficult to pirate a game - try downloading a game on 56k, or burning a multi cd game when the cost of a cd was $1+, or what if you legitimately purchased the game but lost the manual which contained the secret word combination you needed every time you wanted to play the game... at the time the cost to employ code-monkeys was considerably lower, as was the production cost of games... and this also meant that the production quality was considerably lower.
Guess what, you don't really own much of anything. Buy mac os? Gotta put it on a mac, even though you own it and it could be put on a PC. Own some digital music? Up until a few years ago there was a good chance it was DRMed all to hell. Own your property? Nah, you're pretty much just paying to pretend it's yours until the government decides otherwise.
Life isn't sunshine and daffodils. Every day most everyone has to make difficult choices, which I'm sure the Obsidian/Bethesda team did when deciding to go with Steam for the PC version, and I'm sure Steam/Valve did when working out how they were going to unlock/distribute it. Are these choices the end of the world? Not at all. Sometime, somewhere you also made a bad decision that totally screwed up someone's day. Maybe it was out of your hands, maybe it was really your bosses fault but you had to enforce it... maybe you've never had to make tough choices, in which case stop [censored]ing about 3 hours. The average life expectancy in the United States is 77.9 years. That's 341,202 hours. Go make a sandwich, watch a movie, wax the car... whatever. And if you're going to complain about being too damn tired by the time unlock rolls around then you would have been too damn tired to really get the most out of the game anyway.