I don't disagree with it limiting choice and freedom, but you are much more insecure. It doesn't matter how good your encryption or password is if I can change

I don't disagree with it limiting choice and freedom, but you are much more insecure. It doesn't matter how good your encryption or password is if I can change your bootloader to have a program steal that password or read the encryption key out of memory. See some of the thunderstrike attacks for examples of what a compromised bootloader can do.