Without T2: You don't have the option of booting anything securely. With T2: You can boot macOS securely, but everything else is still insecure. If Apple had

Without T2: You don't have the option of booting anything securely. With T2: You can boot macOS securely, but everything else is still insecure. If Apple had denied the option to disable secure boot, and didn't make any affordances to boot other OSes (albeit insecurely), we would indeed have lost freedom. The way they did it, we gained security within the macOS ecosystem without losing any freedom elsewhere.