The windows password is not required for Bitlocker. It doesn't work like macos' filevault. You can configure a dedicated password for bitlocker, or a pin (can

The windows password is not required for Bitlocker. It doesn't work like macos' filevault. You can configure a dedicated password for bitlocker, or a pin (can be alphanumeric) in addition to the tpm, but there's no link between that and your windows account once the os is booted. I think MS' point about the standard bitlocker setup is that people can't just steal the drive and mount it in their own PC, they need your specific PC. And also, that windows is secure enough that if you have the correct PC with the drive and the OS boots, you can't open the windows session (which by default requires a password). So in this context, bitlocker adds some security while being "transparent".