@EA_Aljo
I'm definitely not saying that you're only catering to casual players. I'm only talking about this specific situation in which the XP collectibles from the daily things and HUT Rush are important for some people but useless for others. My main point is that since XP collectibles are available every day throughout the year, those collectibles shouldn't be completely useless for anyone at any point in the year.
In the previous years we had seasonal collectibles available every day throughout the year, and there was always some kind of a way to use those collectibles. Since XP collectibles are a replacement for seasonal collectibles, I think it should be the same with XP collectibles now that all of the Quest for 99 sets have been released.
I just don't think it would make any sense not to allow us to use XP collectibles for anything else than the Quest for 99 when the number of XP collectibles available throughout the year is significantly bigger than the number of XP collectibles used in the Quest for 99 sets.
But anyway, it seems like we are both hoping that there will be some kind of a set for extra XP collectibles, so at least we agree on that.