Opposite to what fandom believes, there are at least two POVs in this show. One, the more obvious one, is Dean’s emotional POV. The not so obvious and mostly forgotten one is Sam’s narrative POV.
A lot of interpersonal or emotional subplots happen through Dean, yes. That’s why everyone seems to think Dean’s POV is the only one. However, there’s also Sam’s POV, or narrative bias as I like to call it, which transforms Sam’s bad decisions into an epic tale of the selfless hero.
Yeah, the annoying thing with Sam’s narrative POV is that somethings which were considered wrong are now suddenly right, because Sam’s story needs it to be so he can be the big hero (like saying yes to an archangel just after Dean gets beaten and shamed for wanting to do the same thing) or the plot comes out of the blue, doesn’t make sense, or is horribly contrived (Sam just happens to there while Dean all of a sudden is unable to deal with a Hell Hound so now Sam has to do the trials for “reasons” or the whole of Taxi Driver where for again those mysterious “reasons” Sam has to go alone with the Reaper to Purgatory and Hell). Whatever, the narrative sways in Sam’s favour regardless because it just has to! The writers don’t care, just so long as Sam gets his hero moment or the storyline.