I think just having Sam as a separate side story is boring. His strength in the story is his role as an antagonist to Dylan. That Sam is so over-perfect gives the player a measure to judge Dylan and how much effort it took him to get Sophia to where she is now (even if there is still a lot of potential for improvement).
Also, Sam's story, because it is somehow connected to Dylan's story, is a bigger storytelling opportunity than most of the other side characters in AWAM. Does Dylan find out what is going on between Sophia and Sam (maybe peeking into Sam's room through the window), and how does he react, or rather, what are the implications for Sophia if Dylan finds out? Sam-Sophia-Dylan is a much better story than just going through a bunch of subplots where Sophia interacts with way to many characters in the same who are otherwise not related to the main story (Sophia as "A wife and mother"). The fact that Sam once uttered a sentence that didn't seem to fit to his all perfect hero role is strange, because it doesn't really fit in with the rest of the story, but not the end of his path as a counterpart to Dylan. I at least hope that L&P will expand the story between the three of them.
I think the story of Sam alone, without the connection to Dylan, is pretty boring, because Sam is just too perfect. It would be the story of a hero who just gets everything without any effort. He's just boring as a character and brings nothing to the story other than his connection to Dylan.