It's certainly a different way at looking at Nature from that of the Romantics, who saw it as the place of ultimate freedom, a force for good, nurturuing and teaching man. But the mountain doesn't do that - it gives them a place to be alone, but also imposes on them all the harshness of existing in close proximity with nature - then of course the threatened strom, the ultimate force of nature, forces them away and back to reality.
Their real lives are very much more improsoned than thiose they lead ion the mountain in terms of emotional freedom - Jack lives a life misrepresenting himslef to Lureen and the newsomes, while Ennis, driven my his fears, moves further and further into himslef and away from human contact. But in a sense both situations are constructed by themselves; the mountain at least offers them freedom, which in the end Ennis is too afraid to take and Jack feels forced to allow Ennis to dictate the terms of his life, thus becoming imprisoned by Ennis's fears as much as Ennis is.