Synthesized answer
The provided passages do not offer a direct answer to the question about the practical implications.
However, one passage states that Hercule Poirot's solution to the crime in "The Murder of Roger Ackroyd" is as "impractical" as it is motiveless [1]. This indicates that the solution itself is considered to have practical shortcomings, though the nature of these implications is not detailed within the provided text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Who Killed Roger Ackroyd? by Pierre Bayard Description: A psychoanalyst and literary scholar offers a re-reading of Agatha Christie's classic novel, "The Murder of Roger Ackroyd," challenging Hercule Poirot's conclusions about the identity of the killer and presenting a new solution to the crime. Categories: Fiction Pages: 182 Snippet: In her most famous work, the murder of Roger Ackroyd, Agatha Christie confounded the conventions of the detective story by exposing her narrator as the killer. But Hercule Poirot's solution to the crime is a motiveless as it is impractical.