Would be a cool way to get a whole load back into circulation whilst controlling the amount of rarer ones. Just a thought x

Well, there are still many expensive older TOT items (especially the 2018 items since they weren't included in TOT last year), and I don't think the Carnival is going to give them away forever. There's also a lot of old expensive Pumpkin Patch items, some of which are needed for achievements.

I think the Free Shop gives away any rarity except for Challenger Loot (and CWs), and any kind of items except for weapons, and I think it has been made to only give Melody Items in the past, so I think it could be made to give away only Holiday Items, but I'm not sure if they could refine it to just Morostide items or if that would be too difficult.