On Grief and Reason (Andrew Ryder)

The premise as I see it in Brodsky's is that there is a distinct parallel between European and "American" poetry, American being written and seen in a certain aspect, with Robert Frost the speaker determines that it has more to do with finding something within oneself rather than the traditional European manner. The European manner which Brodsky underlines as some innocent depiction of an event would not be as wholesome when compared to an "American" work, there in a sense is no motive or reasoning behind the characters and setting like say in "Come In" by Frost.
Brodsky dives deep into his claims straight away by going over every stanza and line of Frost's "Come In" down to the meanings of every word. This then leads him to further branch out into saying that a simple walk in the woods could mean something more, something grim, which in turn really sold his claims for me as it wasn't hard at all to get the full picture of Frost's poem after reading it through a couple more times and listening to Brodsky's assessments towards the piece as a whole. I am, however, confused as to why there isn't anything else to compare this piece to rather than some statements on death as it goes, could there not have been some sort of other aspects to create parallels for? From what I am fully aware of, Brodsky seemingly creates a sharp mental image for the type of character Frost was and what could be expected of from "American" poetry and he made it clear that Frost's work could very well be looked at through a psychological lens for further understanding.