Critic: It is common to argue that there is a distinction between “literary” and “genre” fiction.
Conclusion
It is a specious (i.e. faulty) distinction to say that literary fiction should be interpreted while genre fictions should be merely a source of easy pleasure.
Intermediate Conclusion (because)
No work should be interpreted.
Evidence
When we evaluate a work principally for its themes and ideas, we cut ourselves off from the work's emotional impact.
Evaluate
Whenever we read Role or Main Conclusion arguments, we remind ourselves that there's a 90% chance the conclusion will be the first sentence or will be some rebuttal sentiment.
This argument begins with an Attribution, "It is common to argue that ...", which would lead us to suspect that a rebuttal is coming, and indeed we do get one after the Pivot (but, yet, however).
Goal
We're being asked about the role of the final sentence, which was the premise. Let's look for an answer saying that the last sentence is support / evidence / premise for the conclusion that "no work should be interpreted".