If you go for gold keys you can actually get from the npcs at 4th floor some assist link scrolls (so is not completely useless even for people like us).

In general the event is made to actually let people that are not able at all to reach the sun scroll cap.

Remember that if you are not able to get high streaks in swb or if you are not able to get 5 wins in matsuri or if you can't play at certain times on some days (like for example if you skip once or twice the world boss battle) then you won't actually hit the weekly cap without this event.

Personally speaking i would just want they add also the other event that let us cap the moon scrolls WITHOUT doing 70 kills in bonds every day.

If is annoying and hard to do for me (i'm 180k from a relatively old server, 302), i can't even image how hard is for full f2p or casual players.