Yet
ANOTHER advantage would be the possibility of using a huge 'count-in area' for loose riffs, unfinished or B versions of strophes, unfinished versions of the whole project, etc.
Then, the 'clean' (final) version would start at measure 1!
Turn it 'on' and you have ALL of your project's ideas within a single sequence (if you open more than 1 version of your project as a different sequence, all VST instruments/plugins and wav files reload twice!).
Turn it 'off,' and you can hear/work on your finalized version only!
Again, all within the same sequence.