As others have mentioned, rather than dredging up the Lightning event YET AGAIN, SE will most likely add these items to the cash shop at some point. I agree that this kind of thing is perfect for a cash shop as it allows SE to include limited-time, once-only events without players who joined after the event had passed (or missed it for one reason or another while it was active) from feeling like the items are irrecoverably lost forever.

If players keep insisting that SE dredge up old one-time events just so they can get the gear they missed, it gives SE less flexibility in adding NEW one-time events with NEW gear, emotes, hairstyles, and so on. I'd hate to miss out on a Chrono Trigger anniversary crossover event (with Robo minion!) because SE felt pressured by the fanbase to have Lighning Strike for the sixth or seventh time.