Duh... Looking deeper, there are multiple signs, implications, and outright explicit statements describing the expire-and-replace Daily vs. remain-and-gain Weekly Quests.
Thoughts.
1) Despite the wording differences, the Quests in Queue counter, the completed Weekly Quests counter (mine currently showing 16/16), and the various explicit statements in the Help and Info screens, the visual appearance of the Daily vs. Weekly Quests looks the same. An inset panel completely filled with 4 Quest tiles. There is nothing in the visual presentation to show that the Daily is limited to 4 at a time while the Weekly could have more than 4.
I think this should be changed.
Let the Daily Quests view show 4 quests, either active or "Quest Finished!" Visual implication - you have four and that's it.
Let the weekly quests start off with a scroll bar to show tiles for all the weekly quests. Visual implication, there are more than 4. Tiles could be labeled "Locked, unlocking in xx:xx", "Inactive, complete other quests to activate", "Active" and "Finished".
@Herodite I suggest this interface change be suggested to the developers.
2) While there are both explicit descriptions if you click on various Help or Info buttons, and there are other implications in the differences in wordings and graphical elements, there are also various places where there are no mentions of the differences where one might reasonably expect them.
Neither the announcements in the forum for either Season of Dreams or Season of Joy explain or even imply this difference, nor is there any mention or reference to this difference in the Wiki.
@anonglitch @Herodite, I suggest modifications to both future announcements and to the Wiki be made to add these descriptions.