What is the benefit of having full disk encryption pinned to a machine?
That said, I think that it's better to use alternative approach. Use unencrypted signed system partition which presents login screen. After user typed their username and password, only user home gets decrypted. This scheme does not require TPM and only uses secure boot to ensure that system partition has not been altered. I think that macOS uses similar approach.
If your laptop gets stolen, the thief also has your keys and can also decrypt the hard drive, which the TPM storage initially was supposed to have been invented for to actively prevent.