Worst case I have all my OCRed documents as raw files which I can migrate to whereever.
Files still exist. For my case encrypted as well. My backups roll on the data, not the container.
But I'm not trying to convince you, I tried answering the questions :)
And two answer your last question clearly: I survived before paperless, I'd get along without it. I find a new tool to mitigate my manual labor as good as possible - if that's not possible then jo harm done. I know I'm flexible, I can learn new tools and I'm never vendor or tool locked-in. I have a high level of self confidence when it comes to my tool chain and how I'd adapt any part of it - from password manager to cloud storage and my mail flow.
To be honest I couldn't self host anything if I'd had the fear of being lost if a tool is discontinued.
See and that's what's backwards from my point of view. Even though I was on win mainly back then I refused to buy Nvidia because of their shitty practices.
I'm talking about your and my behavior not about anyone else. :)