R42, same here. My mother did quite a bit of clearing out in various stages, every few years or so, for the last 15 years of her life, and she lived to 80. She was adamant she didn't want for her kids to have a lot to contend with when she eventually died. But she knew that some things were unavoidably going to be left to us.
When she did get her terminal cancer diagnosis, she certainly stopped caring about "the stuff", and was thinking moreso of her immediate needs, and her upcoming end. That was one gift of comfort I could give her, that she could live in her house until the end, and I promised her I would take care of everything for her. I could see the visible relief on her face when she most needed to hear it.
That said, it took me two weeks of full time work to get everything sorted. I was only given two weeks, because that is the rule you're given in 55 & Over subsidized housing. You don't even get to the end of that month you paid for. Mom didn't know that, thankfully.
But it was two weeks of hell for me and my husband. We didn't have time to grieve losing her, and she was a huge part of our lives.
I learned a lot back then, as it was revealed to me that certain friends and family are still just that even after someone dies. Some people really show some strange true colors. They think mostly (or only) of what they can get out of the situation, and in some cases if they feel it's nothing, then they disappear and don't even offer to help with the cleanup. Others were surprise and welcome helpers, including my brother's ex-wife, who had no obligation to stay so connected or be involved. She came to me out of nowhere, told me she always loved my mother, wanted nothing in return, and helped me put things in boxes, and drive things to the Goodwill. I'll never forget that kindness, and it was revealed that she was suffering with her own terminal diagnosis that she didn't reveal until later. Meanwhile, her two daughters - one of them was there by my side for the whole thing and did a lot of packing for me, and got meals sorted for us, while the other one just said "I want that piece of furniture" and never showed up to help, or even pick up that furniture. Also, of my two siblings - my brother really stepped up and did more than I expected - he had a big truck so he was doing lots of hauling of furniture, but my sister - she never showed up for the diagnosis, the chemo, the hospice care, the funeral, or the cleanout. Yet she was really wanting a lot of Mom's stuff nonetheless, and kept getting me on the phone with demands. It was terrible.
I'm just glad that Mom did get rid of a lot of stuff over the years. I recall being horrified at one point when looking at all her collections: crafts, throw pillows, blankets, cedar chests, dolls, ceramics, bins full of fabrics, snow tires, and tables - so many damn tables. She had sorted through and removed the vast majority of all that a while before she passed.