Is it true that in the Steam OS you cannot adjust as many settings as you can on the PC side for game's graphical settings?
look in "Steam OS" you get a different game version than the windows version. so, being different, one thing that happens is devs do not always code the same options in the menu. particularly on games that got ported to linux more just to get it done than to please all the fans that may be on Linux or just to check in the shortest time possible how that process would go so they are more experienced in doing it instead of it being new, and other cases, it's normal for devs to rush things and one easy place to cut some work is allow only presets instead of custom options being full featured.
besides it's meant to be on the livingroom and for casuals who don't want to tinker but want the raw power of a PC, and so the presets are enough some devs think thus leaving the game with only that in the options. it's similar to what happens on console versions of a multiplat game.
