I think I understand why OP suggested that, last week I intended to keep playing dungeon with my lv30 for the Challenge Log ,
but when the Daily Reward was going to reset, suddenly I forgot my 4/5 Challenge Log and queued up for a high-level roulette Orz.

I believe "confirmation" will not be added as current design is same as other quests upon completion.

By the way I got an idea if change quests' exp reward from instant exp to a physical item, for example, an exp. book/scroll/letter...etc, by using this item, you obtain the exp. Moreover, the item could be mail to you so there will be no full bag losing item issue. And it also make the cute moogle mailbox more usage ^^