While true for some games that require their online services. There's nothing keeping you from downloading a game and backing up the install files on your own media to play later... A lot of games will run without steam open if you just run the executable...
Especially when you'll need to move to be in the office, a trip for the interview includes an extra day or two to see if you'd enjoy living in the area where the office is.
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Sounds to me like you want an iPhone... There's nothing wrong with that as long as you know what you're getting into which it sounds like you do...
A project like GOS will never have that level of polish and it seems like that's what you're looking for...