Synthesized answer
The provided passages do not contain information about the practical implications of anything mentioned in "Notes from Underground." The title indicates the work is "Notes from Underground," but no content from the book itself is presented, and therefore no details regarding practical implications can be extracted.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: Dostoyevsky. Notes From Underground / White Nights / The Dream of a Ridiculous Man / Selections from The House of the Dead by Фёдор Михайлович Достоевский