Interesting concept decluttering. While I can see her list for a 20's something, I have different priorities. Is that water filter, long term storage food, grain grinder, rocket stove clutter? I have only used in practice and in some rotation of long term supplies. If I keep the "useful things", high end stove, refrig, sound system, etc and go for that modern clutter free look, and SHTF, will I miss my grain grinder, rocket stove, generator, water filter? My kids consider 75 % of my belongings as clutter or antiques. I like the Raspberry Pi computer and its operating system. Don't feather Gates nest, modular and each piece replaceable and redundant. I love my wood stove, it is large, in the living room, I have a stack of wood next to it, and it has a "hot" presence area. They use propane heat with forced hot air and there is no evidence of any heating going on. I also store a couple of cords of wood on my deck. Covered, easy to get at, and I admit some what of a security blanket. But they have to earn money to pay for the propane, have it available, pay what ever the price is, and have electricity to use it. While modern life and declutter might be in style, I love my redundant clutter and admit to being what is now called a hoarder and my grand mother called being ready for what ever. The main difference that I can see is that she not only survived WW1, the depression, and WW2, but did so in comfort. Rationing never bothered them, they raised their own food, cut their own wood, milled their own lumber, and at times grand father even made his own nails. For about half of their lives they had no electricity as it was not available to the farms. Had flush toilet, running water, windmill and overhead tank, central heat, large furnace in basement, etc. How much of the declutter and hoarding concepts are just an attack on the survival mindset? Tend to view it as that and my one long term use of prepps, 13 day outage of power due to ice storm, left me visiting my decluttered friends at the fire station shelter and trying to help them either drain their plumbing or fix the leaks in it when it thawed out after freezing.
If it is useful, even not at the moment, I keep it. Many times things I have had for years suddenly became needed.Even if it is a bolt, that is a saved trip to the hardware store.
Being that I repaired practically everything, broken things became spare parts and materials, plastic, glass, copper, steel, aluminum, iron, even electronics. The problem with this is, where does it stop? It wasn't that I "might" use it someday, I was actually using this stuff and sorting through it all from time to time. Secondarily, others which have no skills do not appreciate this till they are in a predicament needing some repair where parts are not available.