I don't think there's a huge battery life hit...
   With the exception of a few of us on this list and elsewhere, the
   majority sentiment is:
   Nobody cares about FDE.
   Nobody wants to use a strong password that they have to type during
   boot and during login and whenever the screensaver comes on.
   Nobody wants to wait for the disk to be overwritten with random bytes
   during install time.
   Nobody wants to deal with the additional complexity at re-install or
   recovery time. [Although, recovering a file vault partition with
   Apple's 'internet recovery' is a real treat. Kudos Apple - is that .iso
   signed?]
   Nobody wants to deal with having to remember the complex, strong
   password.
   Basically, the majority of people would be fairly upset at being
   subjected to the limitations of FDE as it is, maybe they can mostly be
   designed / implemented away, but that's point number one - nobody
   cares.
   -Travis

   On Mon, May 25, 2015 at 4:11 PM, anx <[1]anx@riseup.net> wrote:

     What are some bottlenecks to Apple turning on File Vault by default?
     I
     can only come up with "battery life."
             --Anx

   --
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References

   1. mailto:anx@riseup.net
   2. https://twitter.com/tbiehn
   3. http://www.linkedin.com/in/travisbiehn
   4. http://github.com/tbiehn
   5. http://www.travisbiehn.com/
   6. https://plus.google.com/+TravisBiehn