You can still buy stuff with Esoterics right now. Just...most people no longer have those after this long, and another moogle event that for the precedent would have replaced the previous exchange.
Also, for the people complaining that this was back to back: 5.5 and the end of Esoterics was April 12th, the start of Pagaentry was May 14th.
People would have had over two months of time to spend tomes after they were locked off from earning them, and most of the people in the thread aren't even asking for that long.
Having the warning for the timer being a blurb that is easy to miss on the event page did not help either, since they decided to give more attention to where the vendors are than the fact that the exchange will be limited. It is super easy to scroll past that assuming you were familiar with how previous events worked and just scrolled to the actual item list. While it is our responsibility to read everything, there's a lot of reasons why it's easy to make the mistakes people did. The start and end date at the top of the page are the same as any of the other Moogle Tome events, even though they could have easily added that the exchange was limited time there as well.
The in-game text also did not make notice of that addition either, and while we could have been on the forums, watching the official Final Fantasy twitter page, or re-reading the full event page repeatedly, those are not reasonable expectations for an event so similar to previous ones. They could have added a timer for exchange to the vendor window like a lot of gacha games do even just to give a transparent in-game timer. They already do timers for some vendors (including Custom Deliveries) that are visible and would have helped remove confusion.
Even after that, this thread is less about saying it's all on Sqenix, and more just people asking for mercy on an event that had them grind for a month.
So if anyone at Sqenix is reading this, please, give us a grace turn-in time.
If you want to limit or remove some marketable items that's fine, just please let people spend their tomes on the un-tradeables at least.