I think you need a bit of insight here to understand the situation better. Noise restrictions at airports like Birmingham, mean aircraft are parked at the gates overnight. The second daytime operations resume at 06:00 AM, airlines must launch a massive "first wave" of departures to keep their tight, multi leg daily schedules from cascading into delays later in the day.
Because so many flights are scheduled to depart in that exact 06:00 AM to 08:30 AM window, thousands of passengers hit the check-in desks and security lanes simultaneously.
By extending the check-in desk opening to three hours early and pushing the closing cutoff back to 60 minutes, Ryanair and the airport handlers can flatten the peak demand curve to prevents a massive, unmanageable surge at the bag drop desks 80 minutes before a block of flights depart.
While Ryanair frames the adjustment around helping passengers clear longer security lines, the underlying reality is that those security lines are frequently at their absolute worst during that intense, post night flying restrictions morning departure wave.
Ryanair also do this at other airports with restricted night flying operations. Other airlines introduced twilight bag-drop primarily for the same reason.