Topic on exclusive items

[Niwashi]

Time-limited event items are time limited. The event announcements explicitly say the event cannot be completed after it's concluded.

not always available =/= will never again be available

Using the Lightning event again as an example, its quests and gear were only available while the event ran. But they ran it three different times, so the gear went back and forth several times between being available, then unavailable, then available again. There's no pressing reason why SE couldn't run it yet again if they wanted to. We might speculate about how likely that is to happen (and personally I think it won't) but nothing in how that event or its gear were offered says it won't be available again.

Seasonal events are similar. So far, I haven't seen SE repeat the same event activities from one year to the next. A number of other games do so, though, and SE might decide to do so if a particular event was especially popular. A lot of event rewards have been offered again at the following year's event. Not all of them, but any or all of them could be offered again in future. There's no promise from SE in either direction, neither that everything will always come available again, nor that any of it will become exclusive by never being offered again.

The only people telling SE to do anything here are the people who want to re-run tie-in events that are no longer relevant except as a way to obtain unique items.

Well, one group is asking either for events to run again or at least for items to be available again. Another group is demanding that those items be made exclusive by never offering them again. But the former group is generally giving "this would be cool" type of suggestions, while the later group is demanding something as though they had a right to it (when in fact neither group has a right to what they ask for, both are just saying what they'd like). I find the exclusivity team's demands more annoying, because they're more apt to offer their preferences in the form of a demand.