Okayyyy I am confused.

Events are recycled in every Japanese origin "collection" game I have ever encountered in the US.

Like Puzzles and Dragons, had like, 1 event that didn't come back at least once more, back when I played regularly.

And it sure as SUGAR didn't make the album count them as "missing" or taunt you with a count against which you could NEVER get complete.

I have only 20 girls left to catch at this point. And I'm only on world 12 of the main story line. :/

To always be 5-6 away, permanently, no matter how much I work or how loyal I am long term, would kill the game.

It's Nutty as hell to spend all this time coding these events... and then NEVER use them again.

No, I expect that a profit seeking sane developer, seeking to FOSTER the "gotta have em all" mindset would bring events and cards back in a gatcha box as a booster a year or two after the first event, so those missing it can grab it (for a price) and those who have it get the extra SED or whathave you.

So, I can formally submit a suggestion ticket via their system, but I seem to remember hearing devs poke about here.

Long term? Not allowing them to be trade-able + not ever bringing them back + FORCING people to have EMPTY SLOTS (if @Kotono is right) is a recipe for frustration and the top spenders to bail.

Because let's be honest- it's the very gotta have em all mindset that gets folks to drop 100$+ a month on this game. :/