I don't think I've discarded any of them! And hopefully won't ever do so accidentally... Any collectibles I don't want I've either sold back if the option was available, sold to another user, or given away.
There was an event going on a few months ago where we bought a bunch of mystery candies, and some of them could turn out to be rare (my current lineup of five Friday the 13th candies as of this post was a result of that). Some were duds that turned into yellow candies, and I discarded those as I had no use for them.
I hang on to collectibles that were gifted to me by other users, even if they never make it to my lineup. They’re all still shown publicly in my collectible list because these users deserve some form of recognition for their generosity.
I don't like to discard collectables personally because it feels like a waste to me and I hate wasting. If there's a sell back option I do use that most of the time but I do discard old raffle tickets too and sometimes yellow candies in those types of events. I usually try to sell unwanted collectables and if they don't sell I just kinda ignore them. I don't mind having a cluttered inventory, at least for now. I do wish it was a little harder to discard collectables but I've yet to actually do it by accident and idk how they'd make it harder anyway. Maybe an additional confirmation popup? Idk.
Never have I ever discarded a collectible, I'm too careful.
And when there came moments where I could have in the first place like those yellow candies, I'm glad I kept them as I was able to do a sellback on every single one I had barring a couple.
So no, I won't discard any collectible, ever. Not even on accident!
I've never discarded any permanent collectibles, only raffle tickets! I've sold back stuff for sure though, but I usually leave at least one with the unique date. This I've done typically with yellow candies, kept all my weeds!
Just raffle tickets or things such as that. Which can be time consuming depending on how many I decided to get. Would be nice if they would just delete themselves after a set time. I was thinking about discarding the yellow candy I got for the watering event. Only thing I got on the last day, but I still have it in my inventory.