Only on page 4 of the thread so far but I'll offer my 2c anyway...
To OP, it sounds like you could have a high expectations of yourself coupled with bad experiences in "looking after yourself" with potentially a small sprinkle of trust issues as well. I'm making potentially wild claims but I will elaborate with a personal story.
I was dating a women a couple of years ago. She was literally a 9.5 out of 10, blonde haired blue eyed babe. About a year after we moved in together, she lost her job. I was doing relatively well enough for myself so I told her no worries, I'll sort all the finances out while you look for another job. In the beginning she did send out her CV, go for interviews etc but none of them panned out.
She started becoming despondent with finding a job in her industry so I started "guiding" her to a place where she could study whatever else it is she wants to do. I got her text books, taught her the math she needed for her new interest etc etc but each of them fizzled out over a month or three. After many conversations about it, I really just started to realize that she was not a "go getter". She was more than happy to be at home everyday.
Throughout this, she cooked, cleaned, did my basic admin and all the rest. I was relatively happy with that aspect. What really started bugging me was questions like what happens if my arms get chopped off and I can't make a living as an example. Similar to some of the concerns you've mentioned as well. I know there's insurance for this etc etc but I realized there's much deeper seated issues at play here. Similar to your holiday example, she would also make a mess of anything of moderate complexity. She didn't really have any hobbies and just seemed to lack curiosity in life.
One day there was a large fire in a field behind our house. Neighbor phoned me and let me know, I went outside to check. It was serious and reasonably close to the house. I ran inside, told her to come and look and that we need to f*** off out of here immediately. I told her to grab clothes for tomorrow and went to find the dog. By the time I got the dog together and back to her, she hadn't done anything and was essentially paralyzed with fear. I had to scream at her like I've never screamed at anyone before to get he f*** up and move.
For me personally, I realized that as much as women want security, as a man, I want security as well. This goes almost more to the emotional side than the financial side. I started to feel like I couldn't trust her to handle an emergency situation well. Personally, I have no family and I've been my own responsibility for around half of my 30 years so far.
After that I just knew 100% we were not compatible. I want to build, grow, improve etc. I also want to know if sh** hits the fan, I can trust my partner to handle it.
I can relate so well to where you're coming from with this. Unfortunately I don't think there's a way to make someone "get it". You're going to have to move on if you want the security you're looking for.