Question about Boot Time Protection

I've noticed in NAV 2012 that Boot Time Protection by default is off.

 

The help file states: The boot time protection starts Auto-Protect when you start your computer. The Enable Boot Time Protection option provides enhanced security level from the time you start your computer. This option ensures better security by running all the necessary components that are required for computer protection as soon as you start your computer.

 

I remember having it set to 'normal' in v.2011.

 

Is there any specific reason why in 2012 it is set at 'off' per default, other than a possible reduction in speed when booting up the system?