In my opinion weekly missions are too “specific” or too tedious.
Example: collect 12 grimoires is considered medium difficulty, come on…
Either you let us keep the grimoire after death or maybe respawn it somewhere else or more than needed in the level.
Another kind in the same idea :
Succeed X times a secondary mission, same problem. If you play with random people, very difficult to do.
Force the player to execute specific tasks will push him in a certain gameplay, it would be nice if all characters could share the same missions board. Also switching character should be easier/ faster.