Most users don’t want a separate password for disk encryption though, so I’m not sure it’s a huge problem?
If one does not power down your system, your FDE is unlocked. So they only need your Linux user account password to get access to the data on your disk.
FDE only protects your data when it's locked. Normally this is when your system is shut down.
Storage encryption can be attacked differently than a running system.
(E.g. Some Western Digital drives have problems with their hardware encryption and made the data on it irretrievable for many - https://github.com/andlabs/reallymine/issues/53 . More here - https://carltonbale.com/western-digital-mybook-drive-lock-en...).
What is being questioned and criticized is the removal of this choice. Especially when a product claims a commitment to privacy.