Why is it soo hard to adopt a cat?

So I've been trying to adopt a cat and somehow it feels almost as hard as adopting a human... I would love to have a cat around, i'm working from home, have lots of love to give and I know about the responsibility of caring for an animal. Most shelters in my country won't give cats to catparents under 30, you always have to take two, even if you work from home and now one shelter doesn't want to give me a cat because the pictures of our flat I sent them are "too messy". Yes I didn't tidy up extra for the pics and there's some stuff lying around and we cook a lot so our kitchen is used. But everythings clean, the floor is free of stuff, no trash lying around. They are saying it's too dangerous for a cat to live in our space because it's too messy... I've always had cats at my parents house and my room was always messy in my teenage years, our cat didn't care. I don't get it and this really hurts... I also did some dogsitting for a time and had the dog in our flat and it would just walk around stuff... I can't be perfect because I'm also chronically ill and don't have the energy to have the perfect home but how come it's "too dangerous"?

Edit: I live in Switzerland, no stray cats here

And I'm looking for an older cat, that is dominant, a bully or afraid of other cats. I would never just take one that needs a buddy.

And for the abelist people who think disabled people can't be good petowners: my boyfriend of 6 years is abled bodied and very responsible as well. Plus I'm very aware of my limits and I know I can do it.