I agree with you OP. There is a major cost that comes with stuff. Not just in dollars but in time, effort and a mental factor that is very hard to explain. As someone who had parents that had a lot of stuff it absolutely can be a burden to someone else. It doesn't look like you have too much stuff but downsizing certainly comes with a mentally freeing factor. It's hard to explain but there is real truth to the stuff you own ends up owning you for a lot of people. There is an entire series on TV called hoarders that addresses this very concept when taken to the extreme end. Just one knife seems too extreme for me. A large insigno is a top contender. spyderco drunken (wish they made it in other steels), and spyderco mule. If I only get one I might want a fixed blade but I'd have to consider which one.
All that stuff went into small bins and no freaking way will I only own 1 knife or even 5. That wasn't a realistic scenario. I am more curious about it as a mental exercise as I looked at my multiple William Henry, Benchmade, CRK, Endura, Delicate, Dragonfly, Schrade, Buck, etc, not as collected "objects of art" anymore but as users. Most are new in box never carried. So it's time to dispense with that safe queen bullcrap. No offense to others still in that zone. For me at 53, guess I'd write that I need to be over it.
It's 100% true that what was splayed out wasn't actually all that much stuff. The upside of my little project is that I found my brand new EarPods I had misplaced and promptly replaced. They earpieces were in a microfiber bag that was in a drawer between dozens of cables, chargers. Anyone else have 40 pounds of cables? I don't anymore: hdmi, Cat5, fiber optic, RCA patch cables for old school component stereo rack. Dozens of USB-A mini and micro, on and on. How about unknown random DC wall warts. Anyone? An entire bin of just those? Haha.
I tell people who are much older than me that they really need to write down what is a family heirloom. What's valuable. And facetiously what was a .25¢ garage sale piece of junk. Example: my mother had collected a fair amount of Alaskan Native art. She worked at an imaging center in Anchorage and the natives would come in from the villages going door to door with their wares. I'm talking about the real deal: carved polar beer teeth, birch bark baskets, soapstone masks, baleen, scrimshaw, seal skin, beaver hats, and on and on. We had to have an appraiser come to look at the estate. It was a production. Told us what had value and what could be had for chump change. Many parents have amassed similar such collections. How about all the widows that get taken for a ride when the husband dies with a ton of firearms...and knives.