QuickBooks have system requirements for you to have the best experience, @JackThomas.

I appreciate you reading our helpful article that contains the system requirements for QuickBooks Mac 2020. I understand you have trust issues with QuickBooks because of your previous experience. I would feel the same way in the same situation.

Currently, the operating systems mentioned above are the tested ones. We cannot assure you that you will have the best experience with Ventura as it is not in the article. 

Here is an article about the release notes for QuickBooks Desktop for Mac 2020: Release notes for QuickBooks Desktop for Mac 2020.

Leave a comment below if you have questions about the system requirements of QuickBooks Desktop. I'm always here to help. Have a great day.