Online is where you find out whether the offline was disciplined or not. Clean conforms, proper timeline hygiene, locked version control, correct delivery specs - this is the stage where shortcuts from earlier in the pipeline come back to bite.

I treat online as a quality control environment as much as a finishing one. The aim is confidence in delivery: knowing that what leaves the suite matches what was approved, plays correctly on the target platform, and doesn't generate a panicked email at 11pm because something was missed.