After 2 days of careful observation while collecting from my daily Alis, I have not noticed a drop in minimum energy. I get at least 4 from all of the pre-valentines day dailies. I’ve been paying particular attention to the rainbow (rune) Alis, due to the reported lower minimums, and they seem to be dropping less deco lately, but still at least 4 energy.
As katbtodd mentioned, I have noticed that they more consistently drop only 4 during events such as the current one. But as long as 4 stays the minimum, I am okay with that.