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Steam cannot tell you whether your system can run it or not, especially if they didn't make the game, because if it doesn't run then they could be held liable.
I seriously hope this helps you my friend. Always remember that Google is your friend.
-Love
Because the game working at minimum graphical quality, with a 640x480 resolution ay 10FPS is a "game running" but is as enjoyable as stabbing your eyes with a jalapeño dipped in hot sauce.
If Steam tells you "this game will work at this level of performance" and then it doesn't, it's Steam fault.
There are also factors no system-check can look into that can greatly hamper the performance of a game (or even make not run it) like OS degradation or lack of system updates.
Which turns us back to the liability point.
I never said steam had to give an exact answer, they could always just have something that would tell you your stats next to the game's requirments, and you would have to compare it yourself.
Steam adds lots of new features as time goes on. This post was supposed to be a suggestion to them for something they could add, not a question asking how to look up stats.
One of PC's main reasons for being shunned by console gamers is they are unsure about how the specs work. They hear you need to build it yourself or that all games have different requirments and they feel like they might buy the wrong parts and games or pay too much for something they didn't need. This would make it more welcoming and would draw more people in.