sudo is not the only thing that prompts for password in the terminal. There is at least passwd and ssh.

I value ctrl+U a lot more for password prompts than the visual feedback, it's even used by GUI on Linux.

Yeah I would like to fix those too but sudo is the one I encounter most. Also the existence of sudo-rs meant there was less push-back. I seriously doubt the maintainers of openssh or passwd would accept this change.