If I’m not mistaken, mysterium was introduced as a side quest currency.
Why is it in EQ rewards and why is it ALMOST HIDDEN? You cannot see the mysterium in EQ rewards preview. You can only see it in milestones rewards. So that, you should go through so many clicks and levels of EQ information to find that.

Ok, if it is inside EQ, OK, we can accept it. BUT!!!! Why, just WHY there is not a single warning about possible reaching the limit when entering the quest or completing it?
It is so disappointing that when I try to claim 750 mysterium from Platinum track, I can see the warning

Why there is a warning for such a small amount of currency and no warning at all when the question is about 5-7k?
Why this design is so unfriendly, so multileveled, so over engineered?
Upgraded EQ is far away from great implementations and this thing is just one more nail in its coffin. It literally punishes you if you complete it in one evening. Because ha-ha, why not just lose a part of rewards, funny, isn’t it?