I disagree with statement, you can just “keep getting writs if you want” with this new event.
As much as I understand this statement is technically correct, you can only get the rewards when event is active. So time is limiting factor here. Time and terrible event requirements.
Completing single arena run with 6 wins (5 battles due to VIP level) takes me about 12 minutes. This gives 250 valor points per hour.
To get all 5 rewards for the first time, I will have to spend almost 3 hours doing arena without any mistakes (always good cards draws, always 6 wins).
If I want to get second set of rewards, it would require more than 8 hours!
To get third set of rewards, it would require almost 22 hours of such constant win streak!
In reality, it will be hard to get all 5 rewards, not even mentioning starting another set of rewards. Even from daily player perspective, you have to count 60 writs as max possible reward from 1-day arena event!
During 3-days Arena event, you can get 2 sets of rewards (including 120 writs) if you invest slightly less than 3h daily for perfect arena runs (over 8h in total within 3 days).
The question is, are 120 writs worth 8+ hours of doing arena? Probably even more time in reality, as some of your runs won’t be 6 wins for sure.
More than that, if you join good guild, you will get 179 writs every single week from Guild tasks. I feel like I would prefer to spend that 8+ hours getting gold for Legendary Tasks, class exp, medals (eg. doing explore 12) to be honest.
Arena event give you close to nothing, especially if you think about time investment required during the event.
Even if you completely miss 15 Arena events straight (it should take more than half a year to get that many Arena events!), you won’t be even single Imperial Deed behind other players, and you will save like 30-45 hours of your precious time.
Unfortunatelly, for me Arena event sounds like completely skippable event .