It's simple anything that gives a player something no matter how small should be available to the entire player base.
By having half of the flash events during standard work hours stops some people taking part.
All the players who can do them all obviously see themselves getting a small edge and want to keep doing them.
Those who can't do them all see themselves losing something and want them not to come back.
Myself I would prefer the devs to work on content everyone can take part in and enjoy.