In addition to sibling replies, I'll add that a common important use for encryption (and reason to have it be completely standard 100% of the time, even in full

In addition to sibling replies, I'll add that a common important use for encryption (and reason to have it be completely standard 100% of the time, even in fully transparent mode) is storage EOL procedures. It's much easier/cheaper/safer to get rid of an HDD or SSD and feel confident everything is gone if it was all fully encrypted from the beginning and you just need to trash the key.