The one-paragraph verdict

The core idea ports cleanly: applying a single keep-or-discard question to files, email, meetings, and commitments is a genuinely useful forcing function, and the digital-clutter chapters made me actually purge things. The problem is the seams. It’s two authors stapled together — Kondo writes maybe a third of it, Sonenshein supplies the management-research half — and the join shows. The business-school material is competent but generic, the kind of thing you’ve read in five other productivity books, and the whole thing is padded well past the size of its one good idea.

Who should read it

Read it if your work life is buried in tabs, channels, and “I might need this later” folders and you want a clean mental model for cutting. Skip it if you already run a deliberate system (GTD, inbox-zero, whatever) — you’ll find nothing new. It is not a career or strategy book, despite the title hinting that way.

Where it earned its place

It gave me one durable habit: periodically asking whether a recurring meeting, subscription, or repo still earns its place, and deleting it without ceremony if not. That single reframe was worth the afternoon it took to read.

Skip it if…

Skip it if you bounced off the original tidying book, or if you want depth over a tidy mantra stretched thin. This is a short, light read dressed up as more.