I answered this separately, but I think secure by default should apply here, too.

I know many small businesses and non-tech people who give away or sell their desktops without wiping (or knowing that they need to). FDE would largely prevent that problem.

I think too often we take for granted that as more tech-oriented people (making an assumption since we’re having this conversation on Lemmy), we forget that we are in the minority. We are more than capable of turning FDE off, but a lot of people aren’t capable of turning it on.