I didn't read the book but I've read others' assessments of it and have watched some videos of Marie Kondo, so I think I get the gist of it. However, here's my problem.
My dh likes to keep stuff. He has a ton of shoes and clothes, but almost had a heart attack when I asked him to go through his shoes with me. He finally relinquished one of his SEVEN pairs of tennis shoes. He wants to keep magazines, books he never reads, bricks from the fireplace we removed, stuff he bought at auctions, etc etc. Our storage areas, shed, and garage are very cluttered. He will clean out the garage, sweep and rearrange, but not get rid of things. Sigh. He's a wonderful man but I don't know what to do. I do get rid of stuff that he never uses but I don't tell him. He rarely asks for an item I culled. He got upset when I tried to give away ds's Zoobs that we gave him when he was about five. Ds is now 15. We still have them.
But here's the deal...dh really appreciates a clean house. I can't keep it that way unless I declutter.