Originally Posted by
Infindox
The collabs you listed are all events that get brought back every once in awhile. They stated last FanFest that Yo-Kai Watch and XV were eventually coming back. They repeat the XI and DQX one randomly (seen it a few times since I've started playing). Considering that we will be going into a lack of content period after the January patch, I assume that they will try to pepper them in between then and Dawntrail's release to keep people playing.
The pizza emote was a pretty botched collab that, honestly, the best thing that they could have done they did.
Previous Feast rewards is a different topic, but those should be put into either the crystal shop or on one of the "season passes", different colored from the orginal to not take away from the people who won those before.