1Password 8 has greatly improved security architecture compared to the previous versions. Just one example of many: when rendering the item details, the Rust core would not send the password value to the UI layer until the user clicks "Copy" or "Reveal" password.
In addition to that, 1Password 8 has better integration with the operating system that any other version in the past — Touch ID, Windows Hello, Secure Enclave, macOS Accessibility services, etc, etc.