>Typing my passphrase on boot is muscle memory and gives me simple security I can trust.

It's not an either-or. You can combine TPM with passwords which makes it far more secure than password alone. A TPM can enforce password guessing limits, otherwise a password needs to be absurdly long to be secure against GPU bruteforcing attacks. It also prevents someone from swapping out the bootloader with a backdoored version that steals your passwords.

>Also can recover data without my mainboard.

You're supposed to keep a backup of the encryption key when using TPM, in case it fails.