the bsd kernel is made by the same team as the rest of the system, and follows the same release schedule. Thus they can add a new syscall (e.g., pledge in open

the bsd kernel is made by the same team as the rest of the system, and follows the same release schedule. Thus they can add a new syscall (e.g., pledge in openbd), and update all the programs at once to use it. That wouldn't really be possible in a linux distribution.