EDIT: I think the ruling also makes it more difficult in general for the Wizard to end his/her big spells before the day has ended. It's another way to ensure they won't remain out of spells and that they won't request shorter adventuring days just to recharge their spells.
2nd EDIT: By the way, tying the at-wills (and optionally also encounters) to the daily memorized spells is already a mitigating factor that makes it preferable to save the dailies for last, so in the end, the "momentum rules" might really be overkill and more fitting as optional than defaults. :)
Also, thanks a lot for the feedback!!
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